a lot of fixes

econ/agents/price_believe_distribute.py

@@ -8,7 +8,7 @@ class Price_Believe_Distribiute_Agent(Base_Distribution_Agent):
         super().__init__(simulation, business, resource, exchanges)
         self.lr=lr
         self.max_price_adj_rate=max_price_adj_rate
-        self.price_believe={i: 0 for i in range(len(self.exchanges))}
+        self.price_believe={i: 1 for i in range(len(self.exchanges))}
         self.open_orders={i: [] for i in range(len(self.exchanges))}
         self.open_qty=0
 
@@ -24,10 +24,14 @@ class Price_Believe_Distribiute_Agent(Base_Distribution_Agent):
 
     def select_best_cx(self):
         best_id=-1
-        best=0
+        best=-1
         for cx_id in range(len(self.exchanges)):
             cx=self.exchanges[cx_id]
-            potential=cx.get_total_supply(self.resource)*self.price_believe[cx_id]
+            available=(cx.get_total_demand(self.resource)>0)
+            if available:
+                potential=1*self.price_believe[cx_id]
+            else:
+                continue
             if potential>best:
                 best=potential
                 best_id=cx_id