So you just reject the field of economics entirely? Like, lets say that the government adds a 20$ tax/fee on fast food, per burger sold. Clearly McDonalds wou

So you just reject the field of economics entirely? Like, lets say that the government adds a 20$ tax/fee on fast food, per burger sold. Clearly McDonalds would no longer be able to sell burgers for 4 dollars. Thus price would increase. Or supply of burgers would go down (thereby only leaving higher priced burgers in the market).