Tixonomy

Tixonomy is an economy which revolved around the Tix system and uses Tix as currency. During the time which Roblox used it, it worked alongside ( Duoeconomism) the more valuable Robux Economy.

Under tixonomy, players with registered accounts receive Tix from logging in daily. Tix can be exchanged for Robux too, however the value of Tix was far less than Robux. It's also possible to obtain Tix by selling clothes who people could pay for with Tix, or as a reward for people visiting a player's Place.

The Tix system was eventually discontinued by Roblox for the purpose of "product simplicity, botting and not incentivizing certain behaviors". This behavior they're referring to is the use of bot accounts to collect more Tix than would've been possible with just one main account.