The amount of BCH that a miner receives as a reward for adding a new block to the blockchain is decreased by 50% every 4 years. These events are referred to as the Bitcoin Cash halving. The halving mechanism was first introduced by Bitcoin, and is designed to gradually slow down the supply of new coins entering the market. The most recent Bitcoin Cash halving happened in April of 2020.
Currency halving affects the network in many ways. It reduces the amount awarded for mining, so it can drastically decrease profit for some miners. This issue can force some miners to switch to mining other currencies or even stop.
In the case of BCH, the last halving (May 2020) has decreased the total amount of hash power in the network, as many miners switched to BTC for a better profit.
This can have a lot of effects, as it can slow the transaction speeds, increase fees, make the network more susceptible to attacks and generally decrease the quality of service. All of these are known to decrease the price of any cryptocurrency..
However, in the long run, less new coins are added to the network, which lowers the supply factor, and if the demand stays the same, it can cause the price to rise.
Having all this in mind, the repercussions of halving can be quite unpredictable, however, some changes are almost guaranteed.