What does the graph below (profit/sales ratios for 25 Fortune 500 companies) reveal? 
Definitions:
Muscular System
The bodily system that is made up of over 600 muscles, facilitating movement of the body, maintains posture, and circulates blood throughout the body.
NADH
Nicotinamide adenine dinucleotide (NAD) in its reduced form, which is a coenzyme involved in making energy in the body through the process of oxidative phosphorylation.
Citric Acid Cycle
A key metabolic pathway that integrates the energy metabolism of carbohydrates, fats, and proteins through the oxidation of acetyl-CoA, producing ATP.
ATP Synthesis
The biochemical process of creating ATP (adenosine triphosphate), the primary energy carrier in cells, through cellular respiration or photosynthesis.
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