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The sun doesn’t always shine in San Francisco. The city might be the world’s capital of artificial intelligence, but in recent years it has grappled with
economic weakness,
widespread homelessness and drug use, and an exodus of residents to cities such as Miami. That sense of decline may be over. As we write this week,
two trends are driving San Francisco’s comeback.
Now let’s turn to something a little more indulgent. Forty years ago The Economist first published the
Big Mac index,
a light-hearted guide to burger-buying power that tracks currency misalignments around the world.
Dig into its history
and
watch The Insider
to understand how a humble burger can explain profound truths about the global economy. It sizzles. | 
