Imagine a researcher is trying to genetically engineer this virus so it attacks the lung cells of a human in order to "infect" the host with a particular gene to cure a genetic disorder. Explain which structure the researcher would be most interested in working with in order to get the virus to attack the lung cell of a human. 
Definitions:
Investment-Accelerator Effects
The phenomenon where an increase in national income or output leads to a disproportionately larger increase in investment expenditure.
Money Supply
The entire financial resource sum in an economy at a particular time.
Owning Stocks
Owning stocks means having equity or ownership in a corporation, granting the shareholder a claim on the company's assets and earnings, often accompanied by voting rights on corporate matters.
Liquidity Preference Theory
A theory which suggests that people prefer to hold their wealth in liquid form for immediate use rather than in longer-term investments, affecting interest rates and economic activity.
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