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from The Economist. In London, I'm Jason Palmer. And in New York, I'm John Fastman.

Every weekday, we provide a fresh perspective on the events shaping your world.

In a lot of countries, the most widely prescribed treatment for depression are SSRIs,

drugs that regulate the amount of serotonin in the brain.

But a sweeping new review suggests there's actually little connection between serotonin levels and depression.

And in most places, one of the last things shopkeepers do before going home for the night is to lock up their goods.

But in Dakar, vendors of valuable plants leave their wares unguarded.

We explore why and what that says about trust in Senegal's capital city.

First up, though.

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