Making money is easy, but the EXP isn't going up..

First off, if you're going to use profanity in your username or comments, don't bother commenting. I'll report you.. I haven't gotten to the late game yet, but for early game money, the bakery is the answer.. My guess is that buying the ingredients for bakery orders with gems gives more money than a money booster.. But my EXP isn't increasing at all lately.. Does anyone know if the EXP booster or buying EXP from the shop is more efficient? It seems cars also give an EXP buff, how much do they give? Seriously, what's better: EXP booster, EXP gems, or EXP cars..?