Bagi,
PPA= Pay Per Action and PPC = Pay Per Click. With PPC, wether there is a sale or now, you pay Google for the click, with PPA, you only pay Google if the customer actually buy something from your site. PPA is very new, its has not been rolled out on a large scale like PPC just yet.
Yes, my client make his money back, he has been spending this budget for over 1 year now.
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