1)What does "the elasticity of marginal utility of consumption with respect to utility" mean?

2)Why might the price elasticity of supply be different in the long run than a short run?

1)The elasticity of marginal utility of consumption with respect to utility defines, how marginal utility of any commodity consumption response as the utility from consumption changes. According to the law of diminishing marginal return, the relation between marginal utility and total utility should be negative. Negative relationship means as an increase in total utility from consumption of any commodity should decrease the marginal utility of consumption of any additional unit of that commodity.

2)In long run, the price elasticity of supply is more elastic; whereas, in the short run, price elasticity of supply is less elastic. This is because in long run all the factors can be use to increase the supply but in short run only labor is the factor of production which can be increase to increase the supply. In short run, changes in production are more costly comparatively in long run.