Footpedal Enterprises has been in business for five years. This past year was the best year yet, as demonstrated by several indicators shown below.

2005

2004

2003

2002

2001

Inventory turnover

5.2

4.7

4.3

4.5

4.1

Accounts receivable turnover

6

5.7

5.4

5.4

5.3

Gross profit margin

23.2

22.8

22.9

22.6

21.8

Operating profit margin

12.1

12

11.9

11.8

11.9

Your new assistant wonders why upper management is so happy that the inventory turnover, the accounts receivable turnover, the gross profit margin, and the operating profit margin all increased this year. Explain why an increase in each of these items is a positive indicator.