# Why Are Allowances for Certain Types Lower?

Archera's Guaranteed Commitment allowances & premiums are set primarily based on risk as assessed by Archera's underwriting algorithm. This means for certain instance types, services, and regions the number of Guaranteed Commitments available to purchase from Archera can be much lower than for others. This is based dynamically on the amount of demand for the commitments in the marketplaces Archera has access to.

For example, Archera tends to offer the highest Guaranteed Commitment allowances for common EC2 instance types in the most popular regions, given these are the most popular and in-demand commitment types. However, for less popular RDS instance types — which are not as in-demand as EC2 instances — the allowance can be much lower and average premiums higher.

There are also specific ways individual customers can increase their overall allowances as outlined in [How can I raise my Guaranteed Commitment Allowances?](https://docs.archera.ai/help-center/guaranteed-commitments/raise-allowances).

## Related Resources

* [What are Guaranteed Commitment allowances?](https://docs.archera.ai/help-center/guaranteed-commitments/allowances)
* [How can I raise my Guaranteed Commitment Allowances?](https://docs.archera.ai/help-center/guaranteed-commitments/raise-allowances)