Which of the following is one of the main causes of inflation? a. wages drop so workers have to spend a higher percentage of income on necessities. b. demand drops and forces producers to charge more to meet their costs. c. rising unemployment cuts into national income. d. consumers demand goods faster than they can be supplied.

1) the stages a new product goes through from beginning to end, i.e., the stages that a product passes through from introduction through growth, maturity, and decline. 2) the time from initial research and development to the time at which sales and support of the product to customers are withdrawn. 3) the period of time during which a product can be produced and marketed profitably.

                                          hope it

answermarginal cost;