If there is a decrease in demand for a product in a purely competitive industry, it results in an industry contraction that will end when the product price is: î© greater than its marginal cost î© equal to its marginal cost î© less than its marginal cost î© greater than its average cost

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities