diff --git a/res/i18n/ts/fr_FR.ts b/res/i18n/ts/fr_FR.ts
index de43bd2a5d65bcf2c3907edb40c54fa4cdb6f352..15f90e31caef5e0568c102877f9d7ab8620dc9e3 100644
--- a/res/i18n/ts/fr_FR.ts
+++ b/res/i18n/ts/fr_FR.ts
@@ -55,37 +55,37 @@
         <translation type="obsolete">du {0}</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/core/account.py" line="53"/>
+        <location filename="../../../src/cutecoin/core/account.py" line="93"/>
         <source>Units</source>
         <translation>Unités</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/core/account.py" line="53"/>
+        <location filename="../../../src/cutecoin/core/account.py" line="93"/>
         <source>UD</source>
         <translation>DU</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/core/account.py" line="53"/>
+        <location filename="../../../src/cutecoin/core/account.py" line="93"/>
         <source>Quant Z-sum</source>
         <translation>Quant. som. 0</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/core/account.py" line="53"/>
+        <location filename="../../../src/cutecoin/core/account.py" line="93"/>
         <source>Relat Z-sum</source>
         <translation>Rel. som. 0</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/core/account.py" line="53"/>
+        <location filename="../../../src/cutecoin/core/account.py" line="93"/>
         <source>UD {0}</source>
         <translation>DU {0}</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/core/account.py" line="53"/>
+        <location filename="../../../src/cutecoin/core/account.py" line="93"/>
         <source>Q0 {0}</source>
         <translation>Q0 {0}</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/core/account.py" line="53"/>
+        <location filename="../../../src/cutecoin/core/account.py" line="93"/>
         <source>R0 {0}</source>
         <translation>R0 {0}</translation>
     </message>
@@ -842,7 +842,7 @@ Revoking your UID can only success if it is not already validated by the network
         <translation></translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="78"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="72"/>
         <source>
                 &lt;table cellpadding=&quot;5&quot;&gt;
                 &lt;tr&gt;&lt;td align=&quot;right&quot;&gt;&lt;b&gt;{:}&lt;/b&gt;&lt;/div&gt;&lt;/td&gt;&lt;td&gt;{:} {:}&lt;/td&gt;&lt;/tr&gt;
@@ -865,42 +865,42 @@ Revoking your UID can only success if it is not already validated by the network
                 </translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="78"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="72"/>
         <source>Universal Dividend UD(t) in</source>
         <translation>Dividende Universel DU(t) en</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="67"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="72"/>
         <source>Monetary Mass M(t) in</source>
-        <translation type="obsolete">Masse Monétaire M(t) en</translation>
+        <translation>Masse Monétaire M(t) en</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="78"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="72"/>
         <source>Members N(t)</source>
         <translation>Membres N(t)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="67"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="72"/>
         <source>Monetary Mass per member M(t)/N(t) in</source>
-        <translation type="obsolete">Masse Monétaire par membre M(t)/N(t) en</translation>
+        <translation>Masse Monétaire par membre M(t)/N(t) en</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="78"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="72"/>
         <source>Actual growth c = UD(t)/[M(t-1)/N(t)]</source>
         <translation>Croissance actuelle c = DU(t)/[M(t -1)/N(t)]</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="78"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="72"/>
         <source>Next UD date and time (t+1)</source>
         <translation>Prochain DU, date et heure (t+1)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="164"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="160"/>
         <source>No Universal Dividend created yet.</source>
         <translation>Pas de dividende universel créé pour le moment.</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="139"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="135"/>
         <source>
                 &lt;table cellpadding=&quot;5&quot;&gt;
                 &lt;tr&gt;&lt;td align=&quot;right&quot;&gt;&lt;b&gt;{:}&lt;/b&gt;&lt;/td&gt;&lt;td&gt;{:}&lt;/td&gt;&lt;/tr&gt;
@@ -911,37 +911,37 @@ Revoking your UID can only success if it is not already validated by the network
         <translation></translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="139"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="135"/>
         <source>{:2.0%} / {:} days</source>
         <translation>{:2.0%} / {:} jours</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="139"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="135"/>
         <source>Fundamental growth (c) / Delta time (dt)</source>
         <translation>Croissance fondamentale (c) / Delta de temps (dt)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="116"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="135"/>
         <source>UD(t+1) = MAX { UD(t) ; c * M(t) / N(t) }</source>
-        <translation type="obsolete">DU(t+1) = MAX { DU(t) ; c * M(t) / N(t) }</translation>
+        <translation>DU(t+1) = MAX { DU(t) ; c * M(t) / N(t) }</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="139"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="135"/>
         <source>Universal Dividend (formula)</source>
         <translation>Dividende Universel (formule)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="139"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="135"/>
         <source>{:} = MAX {{ {:} {:} ; {:2.0%} * {:} {:} / {:} }}</source>
         <translation></translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="139"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="135"/>
         <source>Universal Dividend (computed)</source>
         <translation>Dividende Universel (calculé)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>
             &lt;table cellpadding=&quot;5&quot;&gt;
             &lt;tr&gt;&lt;td align=&quot;right&quot;&gt;&lt;b&gt;{:2.0%} / {:} days&lt;/b&gt;&lt;/td&gt;&lt;td&gt;{:}&lt;/td&gt;&lt;/tr&gt;
@@ -968,47 +968,47 @@ Revoking your UID can only success if it is not already validated by the network
             </translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>Fundamental growth (c)</source>
         <translation>Croissance fondamentale (c)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>Initial Universal Dividend UD(0) in</source>
         <translation>Dividende Universel Initial DU(0) en</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>Time period (dt) in days (86400 seconds) between two UD</source>
         <translation>Période de temps (dt) en jours (86400 secondes) entre deux DU</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>Number of blocks used for calculating median time</source>
         <translation>Nombre de blocs utilisés pour calculer le temps median</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>The average time in seconds for writing 1 block (wished time)</source>
         <translation>Le temps moyen en secondes pour écrire un bloc (temps espéré)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>The number of blocks required to evaluate again PoWMin value</source>
         <translation>Le nombre de blocs requis pour évaluer une nouvelle valeur de PoWMin</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>The number of previous blocks to check for personalized difficulty</source>
         <translation>Le nombre de blocs précédents pour vérifier la difficulté personnalisée</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="167"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="163"/>
         <source>The percent of previous issuers to reach for personalized difficulty</source>
         <translation>Le pourcentage d&apos;utilisateurs précédents atteignant la difficulté personnalisée</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="202"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="198"/>
         <source>
             &lt;table cellpadding=&quot;5&quot;&gt;
             &lt;tr&gt;&lt;td align=&quot;right&quot;&gt;&lt;b&gt;{:}&lt;/b&gt;&lt;/td&gt;&lt;td&gt;{:}&lt;/td&gt;&lt;/tr&gt;
@@ -1022,44 +1022,44 @@ Revoking your UID can only success if it is not already validated by the network
         <translation></translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="202"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="198"/>
         <source>Minimum delay between 2 identical certifications (in days)</source>
         <translation>Le délai minimum entre 2 certifications identiques (en jours)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="202"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="198"/>
         <source>Maximum age of a valid signature (in days)</source>
         <translation>Age maximum d&apos;une signature valide (en jours)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="202"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="198"/>
         <source>Minimum quantity of signatures to be part of the WoT</source>
         <translation>Nombre de signatures minimum pour faire partie de la TdC</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="202"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="198"/>
         <source>Minimum quantity of valid made certifications to be part of the WoT for distance rule</source>
         <translation>Quantité minimum de certifications valides pour faire partie de la TdC suivant la règle de distance</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="202"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="198"/>
         <source>Maximum age of a valid membership (in days)</source>
         <translation>Age maximum d&apos;un statut de membre valide (en jours)</translation>
     </message>
     <message>
-        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="202"/>
+        <location filename="../../../src/cutecoin/gui/informations_tab.py" line="198"/>
         <source>Maximum distance between each WoT member and a newcomer</source>
         <translation>Distance maximum entre chaque membre de la TdC et un nouveau venu</translation>
     </message>
     <message>
         <location filename="../../../src/cutecoin/gui/informations_tab.py" line="78"/>
         <source>Monetary Mass M(t-1) in</source>
-        <translation>Masse Monétaire M(t-1) en</translation>
+        <translation type="obsolete">Masse Monétaire M(t-1) en</translation>
     </message>
     <message>
         <location filename="../../../src/cutecoin/gui/informations_tab.py" line="78"/>
         <source>Monetary Mass per member M(t-1)/N(t) in</source>
-        <translation>Masse Monétaire par membre M(t-1)/N(t) en</translation>
+        <translation type="obsolete">Masse Monétaire par membre M(t-1)/N(t) en</translation>
     </message>
     <message>
         <location filename="../../../src/cutecoin/gui/informations_tab.py" line="127"/>
@@ -1069,7 +1069,7 @@ Revoking your UID can only success if it is not already validated by the network
     <message>
         <location filename="../../../src/cutecoin/gui/informations_tab.py" line="139"/>
         <source>UD(t+1) = MAX { UD(t) ; c * M(t) / N(t+1) }</source>
-        <translation>DU(t+1) = MAX { DU(t) ; c * M(t) / N(t+1) }</translation>
+        <translation type="obsolete">DU(t+1) = MAX { DU(t) ; c * M(t) / N(t+1) }</translation>
     </message>
 </context>
 <context>
diff --git a/src/cutecoin/core/account.py b/src/cutecoin/core/account.py
index d48cb31d922a9ad356a40fedd9f815043c58f3a9..e713887c7f903ef556dfd4e8927e3f6eb482364c 100644
--- a/src/cutecoin/core/account.py
+++ b/src/cutecoin/core/account.py
@@ -1,8 +1,8 @@
-'''
+"""
 Created on 1 févr. 2014
 
 @author: inso
-'''
+"""
 
 from ucoinpy import PROTOCOL_VERSION
 from ucoinpy.api import bma
@@ -12,6 +12,7 @@ from ucoinpy.key import SigningKey
 
 import logging
 import time
+import math
 
 from PyQt5.QtCore import QObject, pyqtSignal, QCoreApplication, QT_TRANSLATE_NOOP
 
@@ -22,23 +23,62 @@ from ..tools.exceptions import ContactAlreadyExists
 
 
 def quantitative(units, community):
+    """
+    Return quantitative value of units
+
+    :param int units:   Value
+    :param cutecoin.core.community.Community community: Community instance
+    :return: int
+    """
     return int(units)
 
 
 def relative(units, community):
-    ud = community.dividend
+    """
+    Return relaive value of units
+
+    :param int units:   Value
+    :param cutecoin.core.community.Community community: Community instance
+    :return: float
+    """
+    # fixme: the value "community.nb_members" is not up to date, luckyly the good value is in "community.get_ud_block()['membersCount']"
+    # calculate ud(t+1)
+    ud = math.ceil(
+        max(community.dividend,
+            community.parameters['c'] * community.monetary_mass / community.get_ud_block()['membersCount'])
+    )
     relative_value = units / float(ud)
     return relative_value
 
 
 def quantitative_zerosum(units, community):
-    median = community.get_ud_block(1)['monetaryMass'] / community.nb_members
-    return units - median
+    """
+    Return quantitative value of units minus the average value
+
+    :param int units:   Value
+    :param cutecoin.core.community.Community community: Community instance
+    :return: int
+    """
+    # fixme: the value "community.nb_members" is not up to date, luckyly the good value is in "community.get_ud_block()['membersCount']"
+    average = community.monetary_mass / community.get_ud_block()['membersCount']
+    return units - average
 
 
 def relative_zerosum(units, community):
-    median = community.get_ud_block(1)['monetaryMass'] / community.nb_members
-    ud = community.dividend
+    """
+    Return relative value of units minus the average value
+
+    :param int units:   Value
+    :param cutecoin.core.community.Community community: Community instance
+    :return: float
+    """
+    # fixme: the value "community.nb_members" is not up to date, luckyly the good value is in "community.get_ud_block()['membersCount']"
+    median = community.monetary_mass / community.nb_members
+    # calculate ud(t+1)
+    ud = math.ceil(
+        max(community.dividend,
+            community.parameters['c'] * community.monetary_mass / community.get_ud_block()['membersCount'])
+    )
     relative_value = units / float(ud)
     relative_median = median / ud
     return relative_value - relative_median
@@ -250,8 +290,8 @@ class Account(QObject):
         logging.debug("Certification : {0}".format(signed_cert))
 
         data = {'pubkey': certified.pubkey,
-                        'self_': selfcert.signed_raw(),
-                        'other': "{0}\n".format(certification.inline())}
+                'self_': selfcert.signed_raw(),
+                'other': "{0}\n".format(certification.inline())}
         logging.debug("Posted data : {0}".format(data))
         community.broadcast(bma.wot.Add, {}, data)
 
@@ -346,8 +386,8 @@ class Account(QObject):
         selfcert.sign([key])
         logging.debug("Key publish : {0}".format(selfcert.signed_raw()))
         community.broadcast(bma.wot.Add, {}, {'pubkey': self.pubkey,
-                                    'self_': selfcert.signed_raw(),
-                                    'other': []})
+                                              'self_': selfcert.signed_raw(),
+                                              'other': []})
 
     def send_membership(self, password, community, mstype):
         '''
@@ -363,14 +403,14 @@ class Account(QObject):
         blockid = community.current_blockid()
 
         membership = Membership(PROTOCOL_VERSION, community.currency,
-                          selfcert.pubkey, blockid['number'],
-                          blockid['hash'], mstype, selfcert.uid,
-                          selfcert.timestamp, None)
+                                selfcert.pubkey, blockid['number'],
+                                blockid['hash'], mstype, selfcert.uid,
+                                selfcert.timestamp, None)
         key = SigningKey(self.salt, password)
         membership.sign([key])
         logging.debug("Membership : {0}".format(membership.signed_raw()))
         community.broadcast(bma.blockchain.Membership, {},
-                       {'membership': membership.signed_raw()})
+                            {'membership': membership.signed_raw()})
 
     def jsonify(self):
         '''
diff --git a/src/cutecoin/gui/informations_tab.py b/src/cutecoin/gui/informations_tab.py
index 26d9bfe55e6ff40978945d47486e8846a7071545..93db5e17fbb334ae257fa4db4d88a2b68e545e55 100644
--- a/src/cutecoin/gui/informations_tab.py
+++ b/src/cutecoin/gui/informations_tab.py
@@ -48,30 +48,24 @@ class InformationsTabWidget(QWidget, Ui_InformationsTabWidget):
             return False
 
         if block:
-            ud = round(self.get_referential_diff_value(block['dividend']))
+            ud = self.get_referential_diff_value(block['dividend'])
             if isinstance(ud, int):
                 # use the float type of 64bits, to avoid display a 32bit signed integer...
                 localized_ud = QLocale().toString(float(ud), 'f', 0)
-                localized_monetary_mass_minus_1 = QLocale().toString(
-                    float(self.get_referential_value(block_t_minus_1['monetaryMass'])), 'f', 0
-                )
-                localized_mass_minus_1_per_member = QLocale().toString(
-                    float(self.get_referential_value(block_t_minus_1['monetaryMass'] / block['membersCount'])), 'f', 0
+                localized_mass_per_member = QLocale().toString(
+                    float(self.get_referential_diff_value(block['monetaryMass'] / block['membersCount'])), 'f', 0
                 )
                 localized_monetary_mass = QLocale().toString(
-                    float(self.get_referential_value(block['monetaryMass'])), 'f', 0
+                    float(self.get_referential_diff_value(block['monetaryMass'])), 'f', 0
                 )
 
             else:
                 localized_ud = QLocale().toString(ud, 'f', 6)
-                localized_monetary_mass_minus_1 = QLocale().toString(
-                    round(self.get_referential_value(block_t_minus_1['monetaryMass'])), 'f', 6
-                )
-                localized_mass_minus_1_per_member = QLocale().toString(
-                    round(self.get_referential_value(block_t_minus_1['monetaryMass'] / block['membersCount']), 'f', 6)
+                localized_mass_per_member = QLocale().toString(
+                    self.get_referential_diff_value(block['monetaryMass'] / block['membersCount']), 'f', 6
                 )
                 localized_monetary_mass = QLocale().toString(
-                    round(self.get_referential_value(block['monetaryMass'])), 'f', 6
+                    self.get_referential_diff_value(block['monetaryMass']), 'f', 6
                 )
 
             # set infos in label
@@ -88,15 +82,15 @@ class InformationsTabWidget(QWidget, Ui_InformationsTabWidget):
                 """).format(
                     localized_ud,
                     self.tr('Universal Dividend UD(t) in'),
-                    self.get_referential_name(),
-                    localized_monetary_mass_minus_1,
-                    self.tr('Monetary Mass M(t-1) in'),
-                    self.get_referential_name(),
+                    self.get_referential_diff_name(),
+                    localized_monetary_mass,
+                    self.tr('Monetary Mass M(t) in'),
+                    self.get_referential_diff_name(),
                     block['membersCount'],
                     self.tr('Members N(t)'),
-                    localized_mass_minus_1_per_member,
-                    self.tr('Monetary Mass per member M(t-1)/N(t) in'),
-                    self.get_referential_name(),
+                    localized_mass_per_member,
+                    self.tr('Monetary Mass per member M(t)/N(t) in'),
+                    self.get_referential_diff_name(),
                     block['dividend'] / (block_t_minus_1['monetaryMass'] / block['membersCount']),
                     params['dt'] / 86400,
                     self.tr('Actual growth c = UD(t)/[M(t-1)/N(t)]'),
@@ -117,7 +111,8 @@ class InformationsTabWidget(QWidget, Ui_InformationsTabWidget):
                     float(
                         self.get_referential_diff_value(
                             math.ceil(
-                                max(block['dividend'], params['c'] * block['monetaryMass'] / block['membersCount']))
+                                max(block['dividend'], params['c'] * block['monetaryMass'] / block['membersCount'])
+                            )
                         )
                     ),
                     'f',
@@ -128,7 +123,8 @@ class InformationsTabWidget(QWidget, Ui_InformationsTabWidget):
                     float(
                         self.get_referential_diff_value(
                             math.ceil(
-                                max(block['dividend'], params['c'] * block['monetaryMass'] / block['membersCount']))
+                                max(block['dividend'], params['c'] * block['monetaryMass'] / block['membersCount'])
+                            )
                         )
                     ),
                     'f',
@@ -146,15 +142,15 @@ class InformationsTabWidget(QWidget, Ui_InformationsTabWidget):
                 """).format(
                     self.tr('{:2.0%} / {:} days').format(params['c'], params['dt'] / 86400),
                     self.tr('Fundamental growth (c) / Delta time (dt)'),
-                    self.tr('UD(t+1) = MAX { UD(t) ; c * M(t) / N(t+1) }'),
+                    self.tr('UD(t+1) = MAX { UD(t) ; c * M(t) / N(t) }'),
                     self.tr('Universal Dividend (formula)'),
                     self.tr('{:} = MAX {{ {:} {:} ; {:2.0%} * {:} {:} / {:} }}').format(
                         localized_ud_t1,
                         localized_ud,
-                        self.get_referential_name(),
+                        self.get_referential_diff_name(),
                         params['c'],
                         localized_monetary_mass,
-                        self.get_referential_name(),
+                        self.get_referential_diff_name(),
                         block['membersCount']
                     ),
                     self.tr('Universal Dividend (computed)')
@@ -233,3 +229,6 @@ class InformationsTabWidget(QWidget, Ui_InformationsTabWidget):
 
     def get_referential_name(self):
         return self.account.ref_name(self.community.short_currency)
+
+    def get_referential_diff_name(self):
+        return self.account.diff_ref_name(self.community.short_currency)