Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Do mutual fund companies deliberately “censor” their portfolios/funds?
There is a survivorship bias in the mutual fund industry. It's not about individual stocks in which those funds invest. Rather, it's in which funds and fund companies/families are still around. The underperforming funds get closed or merged into other funds. Thus they are no longer reported, since they no longer exist. This makes a single company's mutual funds appear to have a better history, on average, than they actually did. Similarly, fund companies that underperform, will go out of business. This could make the mutual fund industry's overall history appear to be better than it actually was. Most companies don't do this to deliberately game the numbers. It's rational on the part of fund companies to close underperforming funds. When a fund has a below average history, investors will likely not invest in it, and will remove their existing money. The fund will shrink while the overhead remains the same, making the fund unprofitable for the company to run.