Christian Polk identifies three moments when clients are most likely to give referrals: right after they buy, when they see the product work, and at a 30-day check-in. Asking at these emotional peaks instead of random times dramatically increases your referral rate.
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There is absolutely no reason you should not ask every single sale for a referral after you book them. So the highest likelihood that is you're going to get a referral is at emotional high points. In terms of what you sell, this emotional high point is going to change. The first emotional high point is always at the sale because they just bought. That's like the happiest they're going to be is when they just bought. Now, the second time that they're going to see it like, hey, this actually works, whenever they get their first win, you need to be the first person on their mind. Generally speaking, when does it take it for them to actually see— like, I know for real estate, like, it might take a while, but it's like, when do they actually see something like, hey, this works? And then we have a 30-day check-in. Now you'll get more referrals on the 30-day check-in because you asked the first time.