Fix price bound logic

core/lib/market.py

@@ -253,13 +253,14 @@ def get_price_bound(direction, strategy, price, current_price):
     current_price_slippage = D(current_price) * D(price_slippage_as_ratio)
     log.debug(f"Maximum deviation from current price: {current_price_slippage}")
 
-    # Subtract slippage for buys, since we lose money if the price goes down
+    # Price bound is the worst price we are willing to pay for the trade
+    # For buys, a higher price is worse
     if direction == "buy":
-        price_bound = D(current_price) - D(price_slippage)
+        price_bound = D(current_price) + D(price_slippage)
 
-    # Add slippage for sells, since we lose money if the price goes up
+    # For sells, a lower price is worse
     elif direction == "sell":
-        price_bound = D(current_price) + D(price_slippage)
+        price_bound = D(current_price) - D(price_slippage)
 
     log.debug(f"Price bound: {price_bound}")
     return price_bound