to answer the first comment below. @firedragongt
in order so they dont have to keep clicking the smaller ones
all though the cheeper ones are more effective. but only if you had some kind auto bot then clicking it yourself which would over all...
take more time.
hence the best tactic is to buy the bigger once when can
 "Coin Clicker"){kind=icon}
 "Money Click"){kind=icon}
 "Tap Tycoon-Billionaire Simulation Game"){kind=icon}