Add a personal annual calendar reminder for April 1st so you too can send an email like this to your list on April 2nd (assuming sending occasional sales emails is part of your email marketing strategy).
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This is just one of many examples (some obvious, and some not-so-obvious) of how we use buyer psychology to take visitors to your site from "I'm interested" to "That's it, I'm pulling the trigger". We use established principles of behavioral economics to influence. Marketers try and get results by dialing up the marketing volume. We show you how to zig when everyone is zagging.