cyclic.

of or denoting a business or stock whose income, value, or earnings fluctuate widely according to variations in the economy or the cycle of the seasons

Selling Christmas decorations is a cyclical business.

Usually, cyclicals. stocks of cyclical companies.

adjective

circular , patterned , periodic , recurrent , recurring , regular , repeated , repetitive , seasonal , cyclic , isochronal , isochronous , periodical