Autocorrelation functions of covariance stationary series. While interviewing at a top investment bank, your interviewer is im- pressed by the fact that you have taken, a course on forecasting. She decides to test your knowledge of the autocovariance structure of covari- ance stationary series and lists five autocovariance functions:
a. γ(t, r) = α
b, γ(t, r) =e^-ar
d. γ(t, τ)=ατ ,
where α is a positive constant, which autocovariance function(s) are consistent with covariance stationarity, and which are not? Why?

Gary becker's controversial the economics of discrimination concludes that price discrimination has no effect on final profits. price discrimination benefits monopolies. labor discrimination in hiring results in more efficient allocations of production. discrimination in hiring practices has no effect on final profits. labor discrimination harms firms that practice it due to increased labor costs. price discrimination harms monopolies, which refutes over two centuries of economic theory.

Franklin painting company is considering whether to purchase a new spray paint machine that costs $4,800. the machine is expected to save labor, increasing net income by $720 per year. the effective life of the machine is 15 years according to the manufacturer’s estimate. required determine the unadjusted rate of return based on the average cost of the investment.

On september 12, ryan company sold merchandise in the amount of $5,800 to johnson company, with credit terms of 2/10, n/30. the cost of the items sold is $4,000. ryan uses the periodic inventory system and the net method of accounting for sales. on september 14, johnson returns some of the non-defective merchandise, which is restored to inventory. the selling price of the returned merchandise is $500 and the cost of the merchandise returned is $350. the entry or entries that ryan must make on september 14 is (are): multiple choice sales returns and allowances 490 accounts receivable 490 merchandise inventory 350 cost of goods sold 350 sales returns and allowances 490 accounts receivable 490 sales returns and allowances 500 accounts receivable 500 sales returns and allowances 490 accounts receivable 490 merchandise inventory 343 cost of goods sold 343 sales returns and allowances 350 accounts receivable 350