Figure 12.4 shows that from 1990 through 2013, investment spending followed the same trends as stock prices. Does this mean that movements in stock prices cause movements in investment spending? Give an alternative explanation for the fact that they move together.
Figure 12.4

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2,000 20 Investment share of GDP 19 1,600 1% 17 E x 1,200 l6 15 3 14 S 800 Standard and Poors Index 400 13 0 1990 12 1995 2000 2005 2010 Year