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Now let’s revisit Return On Investment.
How much ROI will I derive by investing in a widget-producing machine if I store it idle in my garage?
What is the most important influence on ROI between using the machine (capital investment) in a business enterprise and holding it in reserve?
And more importantly, is it reasonable to regard the widget-producing machine itself (e.g. resource) as a form of wealth?
Whether you get a ROI merely by buying the machine will depend on market conditions. In general, merely by having it you will get no return, but if it's a new machine and suddenly lots of people want them, you may be able to sell at a profit -- but conversely, if suddenly the machines aren't as useful because widgets have dropped in popularity, you'll actually have lost money.
If you only bought one, then an idle machine brings you zero return, while using it will bring you whatever the value of widgets is. OTOH, if you bought a dozen and are using eleven, if one breaks down the idle one can step in and save your production.
The machine is definitely a form of wealth, though its value is dependent on the demand for widgets.

