> ## Documentation Index > Fetch the complete documentation index at: https://docs.supercycle.com/llms.txt > Use this file to discover all available pages before exploring further. # Credit systems > Add price differentiation for items with varying costs By default, Supercycle uses an item-based usage limit on membership plans. If a customer takes out a plan with a 5 item limit, they can have any 5 items at a time. Simple. But what if your store has items of varying value? How do you make sure customers are renting their fair share of your inventory? ## Credit-based usage limits Under **Apps > Supercycle > Settings > Methods > Membership** you can change your credit system.

If you select an items credit system, every item will be worth one credit. If you select a credits credit system, you’ll need to set the number of credits each item in your catalogue takes from a member’s usage limit.

You can call credits whatever you'd like in your [language settings](https://admin.shopify.com/apps/supercycle/settings/languages).