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If overall inventories rise over time because of an increase in unplanned inventory investment, one can conclude that: a. the economy is slowing down. O b. sales were more than had been forecast. O c, inventory investment is negative. O d. the accelerator principle was contradicted. QUESTION 27 A consumption function is a statement that shows the relationship between interest rates and consumption. O True False QUESTION 28 According to Income-Expenditure Equilibrium Model, when income is zero consumption is also zero. True O False