An economics student shopping at a gocery store, looking at all the product and other things going on in the store and trying to relate some things to some economics concept

Help the guy out and relate the whole gocery store and things happening at the gocery store to the following economic concept and be able to quickly explain them vividly

fiscal policy

Opportunity cost

societal constraints

Decision making

Fairness and Efficiency

consumer demands

market and other interaction

Unemployment,employment and Labour force

financial market and financial intermediary

Monetary policy