Explain the investment demand curve is a useful tool to summarize an important and complex relationship in the economy. The determinants that may cause this Investment Demand Curve for the U.S. economy to shift are acquisition; cost of operation; maintenance of investment goods; business taxes; technological change; changes in stock capital goods on hand; and changing expectations about future profits from investments. Which of these factors are affecting the curve today (2009), and in which direction is it moving.