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

Paying Off Principal of Home vs. Investing In Mutual Fund
Excellent answers so far, so I will just add one additional consideration: liquidity. Money invested in a mutual fund (exclusive of retirement accounts with early withdrawal penalties) has a relatively high liquidity. Whereas excess equity in your home from paying down early has very low liquidity. To put it simply: If you get in a desperate situation (long term unemployment) it is better to have to cash in a mutual fund than try to sell your house on the quick and move in with your mother. Liquidity becomes less of an issue if you also manage to fund a decent sized rainy-day fund (6-9 months of living expenses).