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Needing help with some homework questions

In the theory of utility, it is assumed that marginal utility:

diminishes as the consumption of a product increases.
remains constant when consumption of a product increases.
is always zero irrespective of any increase or decrease in consumption.
increases as the consumption of a product increases.
remains constant when the consumption of a product decreases.

Consumers should allocate their income so that the marginal utility associated with the:

first dollar spent is less for high-priced items than for low-priced items.
first dollar spent is equal for all goods.
last dollar spent is equal for all goods.
first dollar spent is greater for high-priced items than for low-priced items.
last dollar spent is lower for high-priced items than for low-priced items.

Which of the following statements is true?

Constant returns to scale occur when the short-run average-total-cost curve is horizontal.
When long-run average total costs are increasing, the firm enjoys economies of scale.
Constant returns to scale are never present in the real world.
Most industries exhibit long-run average costs that are shaped like an upside-down U.
When long-run average total costs are increasing, the firm has diseconomies of scale.

The figure given below shows three Short Run Average Total Cost (SRATC) curves and the Long Run Average Total Cost (LRATC) curve of a firm.

Figure 8.3

Cost C4 C3 SRA TC1 SRA TCz SRA TCa C1 LRATC Q1 Q2 Quantity

Which of the following would account for the shape of the long-run average-total-cost curve in Figure 8.3?

Specialization of labor
Low worker morale
Low productivity
Managerial problems
Administration overhead
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