Cpt doubt

bricks for houses is an example of which kind of demand

1). composite

2).competitive

3).joint

4).derived.

movement along the same demand curve shows

1. expansion of demand

2. expansion of supply

3. expansion & contraction of demand

4. increase & decrease of demand.

a free market economy solves the central problems through

1. planning authority

2. market mechanism

3. both

4.none