Education Referral Rewards: When Should They Pay Out?

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Every place a page here uses this source, in the order the words come in it.

1. Should both the referrer and the referred friend get a reward? “Yes. Double-sided rewards let the referrer offer their friend something rather than ask a favour, which lifts participation more than any increase in the reward amount alone.” How do I make sure I only pay for referrals that convert?

   In Two-sided referral incentives