buy stocks in taco bell then go around with a rpg blowing up all the KFC's you see is what i think some people have suggested.
try it and let us know if it works and how much you invested and how much it rose by.
alternatively after selling share's in taco bell, buy KFC ones at the new lower price and then go around blowing up all the taco bell's.
now if you do this enough times you should get to know where all said restaurant's are making it easier to do and you should make more money faster as a result
Just tried to do the whole Flyus and went about blowing up Airemu and then investing in auguryinsurance and blowing cars up and causing mayhem. But still the market had 0 effect.
As for Taco+KFC im yet to try, but where the hell are they located on the map? half the restaurants have nothing to destroy