To stress-test your scenario with a market crash, we allow you to enter the date of the crash, and the percentage loss in equities. That loss will be reflected in the equity portion for any investment with an allocation to equities. Dividends and income will not be affected. You then set how many years it will take for the market to recover, after which the investments will revert back to their default rates. We allow you to repeat that crash/recover/default cycle again every number years specified until the end of the TIME MACHINE.
You can then select to run the TIME MACHINE with that rate scenario.