I'm not strong at basic maths, so I certainly wouldn't be the right person to be finance minister; people like Chamath ar much better at that

There are loads of qualified people — actually, to be frank, everyone in my cabinet was chosen from a top list worldwide for the cabinet

Mostly

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I would always prefer to be the least knowledgeable person in the room

If you're not the least knowledgeable person there, that can suggest a different concern — being the most knowledgeable isn't always ideal