game mechanic that can be exploited for coin

[pegy]

Hello everybody,

 

so i found a game mechanic that allow the player to have coin for very cheap. When you feed a pig he/she poops and when you take the manure he/she gives you a coin. You can repeat that a lot. So just wanted to tell that, not a bug persay but maybe a mechanic that can be exploited a bit too much. So now i will leave you i need to pick up manure