Pool gets rewarded for producing blocks. Based on the stake size, the pool is given several opportunities to produce a block in assigned slots. It may happen that for various reasons the pool does not create blocks in all assigned slots. In this case, the reward per epoch is reduced, which will be reflected in the reward for stakers. If the pool does not create any blocks, it will not receive a reward. Smaller pools get fewer opportunities to become slot leader in a given epoch, so they will create fewer blocks. It may happen that a very small pool will not create any blocks in one epoch because it did not get the opportunity, but will create two blocks in the next one. The performance of a pool must therefore be monitored over a longer period of time.
