Amazon/Buffett healthcare venture to close after three years
The three companies hoped that they could join together to reduce healthcare costs

The three companies hoped that they could join together to reduce healthcare costs
Berkshire Hathaway says downturn in air travel has slashes demand for products from its Precision Castparts division that cost $32bn in 2016
Benjamin Graham refined the widely used price-to-earnings ratio for valuing companies
Mr Buffett warned 'the world has changed for airline' and passenger numbers may not recover