At 78, Carl Icahn shows little sign of retiring, or of becoming more polite. After finally prodding Forest Labs into a $25bn takeover by Actavis, he renewed his attack on eBay this week, accusing John Donahoe, its chief executive, of being “completely asleep or, even worse, either naive or wilfully blind”.

Antony Jenkins’ efforts to change the culture of Barclays by cutting bankers’ pay are on hold. At its investment bank, it is paying bonuses that are 13 per cent higher to “compete in the global market for talent”. The bank’s chief executive wants to reform the pay of US and Asian investment bankers but it is beyond his contro

John Gapper

Russia’s nascent crackdown on Bitcoin is misguided, in my view, but it reinforces a point that some supporters of virtual currencies tend to underestimate: governments can ban them if they choose.

That sounds like an obvious point, but some libertarian enthusiasts for Bitcoin talk as if it can challenge fiat currencies without governments and central banks being able to stop it. John McAfee, the anti-virus entrepreneur, is one of them: Read more

John Gapper

Aston Martin recall gives an insight into the supply chains of even luxury carmakers (Bloomberg)

Aston Martin’s recall of most of the cars it has built in the past six years is damaging to the company, but even more damaging for the reputation of parts suppliers in the Pearl River Delta in China. Read more

Bitcoin is being forced to grow up fast. The arrest last week on money laundering charges of Charlie Shrem, a leading Bitcoin champion, coincided with a regulatory hearing in New York to consider what on earth it is – a virtual currency, speculative asset or a means of exchange?

John Gapper

Are we seeing the emergence of a grand alliance between Google and Samsung for Android mobile devices, similar to the Microsoft-Intel alliance for Windows personal computers? It looks like that from events this week:

On Monday, Google and Samsung announced a long-term patent licensing deal. That will give the two sides access to each other’s patented technology and allow Samsung to concentrate on its legal battle with Apple. Read more

Tom Perkins, the Silicon Valley venture capitalist, made a terrible mistake by comparing criticism of rich Americans – the “1 per cent” – to the Kristallnacht attack on Jews in Germany in 1938. Mr Perkins, co-founder of Kleiner Perkins Caufield Byers, has since apologised.

Thousands of chief executives, politicians, leaders of non-governmental organisations and media folk are once again assembled in Davos for their annual debates on how to improve the world. It is a worthy affair, with “stakeholders” discussing how best to combine business with societal good, like an ersatz global parliament.