Why don't brokerages charge commissions on forex trades?

External question — Personal Finance Stack Exchange Author: Victor123 Original post: https://money.stackexchange.com/questions/22726 License: CC BY-SA 3.0 — https://creativecommons.org/licenses/by-sa/3.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Why don't brokerages charge commissions for forex trading but do charge them for stock trading? Is it because the high liquidity of the forex market makes it easier to buy and sell, so brokerages don't have to work as hard to match buyers and sellers?