When paying a worker, employers can use various methods and combinations of methods.[2] Some of the most prevalent methods are: paid a wage by the hour (known as "time work"); paid an annual salary; salary plus commission (common in sales jobs); base salary or hourly wages plus gratuities (common in service industries); salary plus a possible bonus (used for some managerial or executive positions); salary plus stock options (used for some executives and in start-ups and some high tech firms); salary pool systems; gainsharing (also known as "profit sharing"); paid by the piece – the number of things they make, or tasks they complete (known as ‘output work’); or paid in other ways (known as ‘unmeasured work’[lower-alpha 1]).[4]