What changes to our model would make that the Aggregate Demand (AD) curve would become flatter in our AS AD diagrams. Group of answer choices The ZLB is binding Firms' demand for investment spending is less sensitive to changes in the real interest rate. None of the options is correct The central bank fights inflation less aggressively. Firms' demand for investment spending depends positively on short-run output. Firms' pricing decisions are more sensitive to demand conditions