I found a glitch that leads to an even easier way to make infinite money: 1. Make one of any monster and put it in a stall. 2. Sell monster. 3. Select stall again and click on "accept" even though it's greyed out. Whichever monster you put in the stall will be back for free, and you can repeat ad infinitum. Doing this with the Kraken means +1700 every time. Makes it really easy to buy everything by the third month or so.
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thank you for the bug report