True or False: Which ones are true and which ones are false...

1.) Diseconomies of scale means that average cost of output increases as the firm grows in size.

2.) Economies of scale and diseconomies of scale are short-run concepts.

3.) In the short run production model, we usually assume labor is fixed.

4.) In the short run production model, we usually assume capital is fixed.

5.) Diminishing marginal utility means that marginal utility is negative.