Taking advantage of the market crash

[Samuel Chua]

Assuming the market crashes again, both the property and the rent is going to decrease by significant amounts. Hence, should i buy a property based on its potential value? Or based on its actual rent, during that crisis. This is because, if i base it on its potential, i might lose out during the crisis but gain much more when the market slowly revives. It would be amazing if you could guide me on this, thanks!