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The world’s largest cryptocurrency has been on a tear this month, propelled by purchases from Tesla and institutional investors who say Bitcoin is an attractive alternative to gold and the dollar.

Bitcoin gave up all its gains from weekend trading as analysts questioned whether the cryptocurrency is overheated. Prices dropped as much as 8.2 per(...)

Elon Musk – the world’s greatest gift to cryptocurrencies?  Photograph: AP

Elon Musk is the world’s greatest gift to cryptocurrencies. These “coins”– really little more than lines of code – still have few real-life use cases.(...)

Photograph: iStock

Global stocks rose for the seventh straight day to reach a record high on Tuesday, while bitcoin also reached a peak after an endorsement from Tesla i(...)

Tesla purchased $1.5 billion  worth of bitcoin, and announced it will soon start accepting the cryptocurrency as a form of payment for Tesla products. Photograph: Michael Reynolds/EPA

Bitcoin hit a fresh record above $47,000 on Tuesday after Tesla’s announcement of a $1.5 billion investment in the largest cryptocurrency. The token (...)

GameStop shares doubled in pre-market trading on Friday after a wild ride of a week. Photograph: The New York Times

It’s being billed as Occupy Wall Street 2.0. But instead of the demonstrators who camped outside the likes of the New York Stock Exchange in a global (...)

Tesla founder Elon Musk

Tesla is still struggling to generate consistent profit margins from selling its electric cars, leaving it reliant on sales of regulatory credits to l(...)

Apple employs about 6,000 people in Ireland, most of them in Cork. Photograph: iStock

Apple on Wednesday reported Christmas quarter sales and profits that beat Wall Street expectations, as new 5G iPhones helped push handset revenue to a(...)

The shortfall of about 0.5 gram of carbon dioxide emitted per kilometre driven may lead to a fine of more than €100 million for Volkswagen. Photograph: Krisztian Bocsi/Bloomberg

Volkswagen narrowly missed complying with stricter emissions standards set by the European Union last year, a disappointment for the company plotting (...)

The messaging app Signal. Photograph: Giulia Marchi/The New York Times

Stocktake has previously pointed out that speculators can make a bundle by betting on stupidity – that is, anticipating uninformed traders will pile i(...)

Fevered price action in the likes of Tesla (chief executive Elon Musk, above) doesn’t mean the wider market is a bubble. Photograph: Alexander Becher/EPA

Signs of speculative excess are not hard to find right now – just look at the price action in Tesla and bitcoin. Are markets getting bubbly? Stocktak(...)

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