Which factor is NOT considered when influencing investor decisions?

The factor that is not typically considered when influencing investor decisions is market popularity. While the attractiveness of an investment can certainly be influenced by its general popularity or trends in the market, it is not a fundamental or necessary factor that investors should base their decisions on.

Investors often focus on more concrete and quantifiable factors such as the size of the investment, which indicates how much capital can be allocated; liquidity, which describes how easily an investment can be sold or converted to cash without significantly affecting its price; and income tax advantages, which can affect net returns on investment. These factors are essential for assessing risk, potential returns, and the overall fit of an investment within an individual's or entity's portfolio, making them more reliable indicators for decision-making compared to market popularity, which may fluctuate based on trends and perceptions rather than solid fundamentals.