By what means do people put their earnings back into the economy?

Let's suppose you are Cop or Teacher (Working for goverment.) You go market to buy Water and Honey you pay to market owner then the market owner goes to Haircutter then Haircutter goes to some building to pay his tax then the goverment gives you your payment it goes like this ...

Also when you buy something from local store not the supermarket the store will earn that money then it will grow your place because the money will turn around your city not to let's say China or other country in any way

Answer : Spending money localy