Media tycoon Rupert Murdoch claimed Britain is "far more successful" because of Baroness Thatcher's "brave leadership".
Mr Murdoch praised the former Prime Minister's role in facing down the trade unions in the 1980s and said the Government made it possible for News International to survive a year of industrial action fighting against a move of operations to Wapping, East London.
The tycoon wrote in The Times (£): "Mrs Thatcher understood that risk was a vital ingredient in a free enterprise society. She understood that such a society had to be led by a government with backbone.
"After the Second World War, in which the country lost a second generation of its finest men, Britain had created a dependency state. It killed off aspiration.
"In 1979 Margaret Thatcher set about its rehabilitation. She put the economy on a sound footing, she ended a culture of crippling strikes, she encouraged entrepreneurs to come here and set up their businesses.
"Thanks to her I have experienced in Britain many of my defining moments as a businessman, a Britain that is far more successful as a result of her brave leadership."