Zero-hours contracts: Vince Cable on dealing with 'abuses'
5 August 2013 Last updated at 15:18 BST
More than a million UK workers are on zero-hours contracts with no guarantees of shifts or work patterns - four times official estimates, research suggests.
A survey of 1,000 employers by the Chartered Institute of Personnel and Development indicated 3-4% of the whole workforce were on such contracts.
A review of the contracts by Business Secretary Vince Cable is already under way, amid union calls to ban them.
Mr Cable said: "I think at one end of the market there is some exploitation taking place"