A report estimates there are 1.4 million UK workers on contracts that do not guarantee minimum hours, as a union claims many on controversial zero-hours contracts are paid less than the living wage. The Office for National Statistics (ONS) said most of the contracts it identified were zero-hours, under which people are not guaranteed work from one week to the next. There is concern that zero-hours contracts do not offer enough financial stability and security as some workers on zero-hours contracts are not being given enough hours.  Employees on zero-hours contracts also do not have the same employment rights as those on traditional contracts, and critics are concerned that the contracts are being used to avoid employer responsibilities to employees.