What there is shift and movement along the demand curve?

When price of the commodity changes, then there is a movement along the demand curve and when there is a change in other factors like fall in income, a decrease in the price of substitute or increase in the price of complement.

What is the difference between Primary and Secondary Market.

In a primary market transaction, the corporation is the seller, and the transaction raises money for the corporation. There are two types of transactions. 1. Public Offerings 2. Private Placements(negotiated sale involving a specific buyer) In Secondary Market, transaction involves one owner or creditor selling to another. Transferring ownership or corporate securities.

When do we use t test and z test?

Z-tests are statistical calculations that can be used to compare population means to a sample's. and T-tests are calculations used to test a hypothesis, but they are most useful when we need to determine if there is a statistically significant difference between two independent sample groups.