Tactic X: "Give away free product or usage of your service" (talk about Ariely's theory of social norms vs market norms)
Tactic Y: "Up-sell free users into a more compelling value proposition" (distinguish between the free product/service and use it as a framing exercise to get your users to pay)
Maybe something like:
"Strategy: Giving away for free and then upsell"
Tactic X: "Give away free product or usage of your service" (talk about Ariely's theory of social norms vs market norms)
Tactic Y: "Up-sell free users into a more compelling value proposition" (distinguish between the free product/service and use it as a framing exercise to get your users to pay)