Below are some key financial ratios for Amazon and Walmart, two competitors in the retail market, over a three year period. Pick one of the financial ratios, complete a time-series and cross sectional analysis.

	Amazon
	12-2017	12-2016	12-2015
Days in Inventory	36.59	37.41	39.78
Receivables Turnover	16.54	18.42	17.78
Asset Turnover	1.66	1.83	1.78
Current Ratio	1.04	1.04	1.08
Debt/Equity	1.37	0.79	1.06
Return on Equity	12.91%	14.52%	4.94%
Interest Coverage	5.49	9.04	4.42
Profit Margin	1.71%	1.74%	0.56%
	Walmart
	01-2018	01-2017	01-2016
Days in Inventory	42.44	44.21	45.30
Receivables Turnover	87.40	84.80	77.75
Asset Turnover	2.48	2.44	2.39
Current Ratio	0.76	0.86	0.93
Debt/Equity	0.47	0.54	0.55
Return on Equity	12.67%	17.23%	18.15%
Interest Coverage	7.49	9.66	9.49
Profit Margin	1.97%	2.81%	3.05%