STORY: From storm clouds gathering over Evergrande, to why Meta thinks it’s time for mixed reality, this is The Week in Numbers. 81% is the slump in shares for embattled Chinese property developer Evergrande since trading in the stock resumed last month. The stock plunged again, and was later re-suspended, after news that chairman Hui Ka Yan had been put under police watch. It all added to jitters over what might happen if the giant firm went under. $90 billion could be the value put on ChatGPT-maker OpenAI. That’s according to the Wall Street Journal, which says the firm plans a sale of existing shares. If confirmed, that would be three times the valuation put on OpenAI just a few months ago. Up to $4 billion is how much Amazon is investing in AI startup Anthropic. That as it bids to catch up with ChatGPT. The e-commerce giant says the deal would give cloud customers early access to Anthropic’s tech. $500 is the starting price for Meta’s new headset. Boss Mark Zuckerberg says it’s a breakthrough in bringing mixed reality to the mass market: “Quest 3 is the most powerful headset that we have ever shipped and it allows you to blend the physical and digital worlds together.” Meta also unveiled new smart glasses and a host of AI chatbots. And $500 is also the cost for one particular pair of sneakers, which helped set a new women's marathon world record this week. Adidas is testing how far it can push prices with a new model. What’s more, the Adizero Pro Evo 1 shoes are only meant to last the length of one marathon. That works out at about $19 per mile.