In more mathematical terms, the value a rec engine provides you looks like: value = k1 * users + k2 * products + k3 * products * users Prioritize building you

In more mathematical terms, the value a rec engine provides you looks like: value = k1 * users + k2 * products + k3 * products * users Prioritize building your rec engine feature after you've built user on-boarding features and product on-boarding features because without users and products, rec engines contribute 0 value.