How do concrete materials support Piaget's theory of preoperational intelligence?

Support the claim that economic theory encompasses the inter-dependence of price theory and income theory?

• provide logical arguments to support or refuse the claim that economic theory encompasses the inter-dependence of price theory and income theory. pls make it broad.

• Answer:

  It sounds like the question has as a general aim that of calling for the supply and demand nature of economics. Thus if price theory give one characteristic (demand) curve on a graph of price verses quantity, and income give a second (supply) curve for what people are willing to pay, then it can be said that the resulting cross-over point is a economic theoretical result of the two previous theories for price and income. This answer is not very satisfactory, but the question is so vauge that it is about all I can come up with!