Why should investors when buying/selling stocks pay attention to "liquidity"?

Real estate and equipment, on the other hand, are not liquid assets, but stocks and bonds are. If you want to be able to purchase or sell an investment on short notice, you must take the liquidity of the investment into consideration. In order to satisfy short-term financial commitments, such as incoming invoices, a corporation must maintain a particular level of liquidity.

Explanation:

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even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.