Why is this restriction so useful in economic analysis? Because one of the two variables might have a larger impact on a third variable than the other one being examined.

If other variables that do not interact with these two variables are not held fixed, the true relationship between the two
variables would be hidden.

To fully understand the relationship between two variables, it is necessary to change each of the variables sequentially
while holding the others constant.

If every variable is allowed to change, it would be impossible to isolate the impact of one variable on another.

University hero is considering expanding operations beyond its healthy sandwiches. jim axelrod, vice president of marketing, would like to add a line of smoothies with a similar health emphasis. each smoothie would include two free health supplements such as vitamins, antioxidants, and protein. jim believes smoothie sales should fill the slow mid-afternoon period. adding the line of smoothies would require purchasing additional freezer space, machinery, and equipment. jim provides the following projections of net sales, net income, and average total assets in support of his proposal. sandwichesonly sandwiches and smoothies net sales $ 750,000 $ 1,350,000 net income 120,000 210,000 average total assets 350,000 750,000 return on assetschoose numerator ÷ choose denominator = return on assets÷ = return on assets÷ = profit margin÷ = profit margin÷ = asset turnover÷ = asset turnover÷ = times