Economies of scale occur when a firm'sa. marginal costs are constant as output increases. b. long-run average total costs are decreasing as output increases. c. long-run average total costs are increasing as output increases. d. marginal costs are equal to average total costs for all levels of output.

Option (b) is correct.

Explanation:

Economics of scale occurs when a firm's long run average total costs decreases as there are more number of units produced.

Basically, economics of scale is a cost advantage that is experienced by the firms or companies by increasing the level of production.

This is happened because of the indirect relationship between the per unit fixed cost and output level. The larger the output produced results in lower per unit fixed cost.

There are two types of economies of scale that are internal and external economies of scale.

all of them make sense but, i would have to say ask someone who has been there/or lives there, and/or read recent newspapers from that city.

hope this !

if it is for a job, then you should learn everything you can about the job, like what does it involve, what qualification is required and how you are the right person for that job. dress appropriately for the interview. get plenty of rest the night before. good luck!