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21. What is the feature about ideas that allows objects and ideas to have in- creasing returns together? A. Excludability B. Non-excludability C. Rival D. Non-rival 22. According to the quantity theory of money, if the money supply grows much faster than real GDP, then the economy will experience A. Hyperinflation B. Inflation C. Stagflation D. Deflation 23. Consider the Cobb-Douglass production function Y = AK1/312/3, what equa- tion describes the growth rate of y (gy) in terms of the growth rate of tech- nology (gA), capital (gx), and labor (91)? A. gy = gA + gx + gL B. gy = gA + 9K + 9L 2/3 C. gy = gA + 39k + 391 D. JK = gA + gx + 291