Consider the following model of the IS curve without an international sector (i.e., imports = exports = 0). Final expenditures are characterized by the following three equations: Consumption: 𝐶 𝑡 𝑌 ¯ 𝑡 = 𝑎 ¯ 𝑐 + 𝑏 ¯ 𝑐 ( 𝑅 𝑡 − 𝑟 ¯ ) Investment: 𝐼 𝑡 𝑌 ¯ 𝑡 = 𝑎 ¯ 𝑖 − 𝑏 ¯ 𝑖 ( 𝑅 𝑡 − 𝑟 ¯ ) Government expenditure: 𝐺 𝑡 = 𝑎 ¯ 𝑔 𝑌 ¯ 𝑡 Assume that ∞ > 𝑏 ¯ 𝑖 > 𝑏 ¯ 𝑐 > 0 . In contrast to the assumptions we made in class, consumption in this version of the model responds to changes in the real interest rate. Based on this information, the IS curve is:Single choice