If disposable income increases by $1 and consumption goes up by $0.80, we can conclude that. O a. The marginal propensity to save is 0.8. O b. The average propensity to consume is 0.8 O c. The...

Extracted text: If disposable income increases by $1 and consumption goes up by $0.80, we can conclude that. O a. The marginal propensity to save is 0.8. O b. The average propensity to consume is 0.8 O c. The marginal propensity to consume is 0.8. O d. The marginal propensity to import is at least 0.8.