If an industry's long-run average total cost curve has an extended range of constant returns to scale, this implies that a. both relatively small and relatively large firms can be viable in the industry.
b. the industry will comprise a very large number of small firms.
c. technology precludes both economies and diseconomies of scale.
d. the industry will be a natural monopoly.

San ruiz interiors provides design services to residential and commercial clients. the residential services produce a contribution margin of $450,000 and have traceable fixed operating costs of $480,000. management is studying whether to drop the residential operation. if closed, the fixed operating costs will fall by $370,000 and san ruiz’ income will

Sales at a fast-food restaurant average $6,000 per day. the restaurant decided to introduce an advertising campaign to increase daily sales. to determine the effectiveness of the advertising campaign, a sample of 49 days of sales were taken. they found that the average daily sales were $6,300 per day. from past history, the restaurant knew that its population standard deviation is about $1,000. if the level of significance is 0.01, have sales increased as a result of the advertising campaign? multiple choicea)fail to reject the null hypothesis.b)reject the null hypothesis and conclude the mean is higher than $6,000 per day.c)reject the null hypothesis and conclude the mean is lower than $6,000 per day.d)reject the null hypothesis and conclude that the mean is equal to $6,000 per day.expert answer

Lee earns $1,482 of interest in 270 days after making a deposit of $15,200. find the interest rate.