These are happy times for lovers of fast-tapping games!
BUT you will also need to use your strategy to maximize the power button performance! You can speed up the activity on your barbershop, but the button will need some time to cool down! Study when is the best moment to accelerate things! And learn to stop :P 
We'll give you a hint... One object in your barbershop will improve (after unlocking it) the green button properties!