According to the law of diminishing marginal utility:

a. you should never consume more of something if your marginal utility is decreasing.
b. if your total utility is increasing as you consume more of something, then your marginal utility must be increasing as well.
c. as you consume less of something, your marginal utility from consuming that good will increase.
d. as you consume less of something, your total utility will decrease.

Martha is one producer in the perfectly competitive jelly industry. last year, martha and all of her competitors found themselves earning economic profits. if there is free entry and exit, what do you expect to happen to the number of suppliers in the industry and the price of jelly? the number of suppliers will increase, and the price of jelly will fall. the number of suppliers will decrease, and the price of jelly will increase. the number of suppliers will increase, and the price of jelly will increase. the number of suppliers will decrease, and the price of jelly will fall.