So, when we play, I set the alarm on my iphone to go off in one hour. After the alarm sounds, all payments to other players are doubled. (Payments to and from the bank stay the same.) This allows us to bankrupt each other more quickly. Then we set the alarm again to give us another hour (or so) of play. When it sounds, whoever has the most cash is the winner.
There you have it. No deep message; just a tip on playing monopoly.