Category Archives: Very basic economics

Facebook’s and eBay’s monopolies are very different from, and scarier than, Google’s. But what about Amazon?

People talk a lot about “Internet monopolies like Google and Facebook”, as though they are the same kind of thing. Even as astute a commentator as Tim Harford (alias “The Undercover Economist”) lumps them together in statements like “Google dominates search; Facebook is the Goliath of social media; Amazon rules online retail”.

But these “Internet monopolies” actually fall into completely different categories.

Google dominates search because it offers the best general-purpose search engine currently on the market.

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The only thing I have to say about Thursday’s election

It’s been a bit more than six weeks since I said I was giving up on politics, and it’s gone pretty well. Fiona says I am much nicer to be around. I’ve completely stopped searching for political stuff on Twitter (though some inevitably comes my way nonetheless), and — crucially — I’ve blogged nothing at all on the subject.

Now I am breaking my fast a single time, three days before the General Election, to say these two things.

First: vote. Don’t miss this opportunity. Make your voice heard. Even if you are in a safe seat, your vote affects the size of the majority, which will affect how much authority your MP has. Vote.

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Interesting people disagreeing about inequality

Here is a fascinating series of four articles.


It starts with Paul Graham’s recent essay Economic Inequality. (Many readers of this blog will know Graham from his many fascinating essays, including Why Nerds Are Unpopular, What You Can’t Say and The Age of the Essay; and from his excellent book Hackers And Painters [Amazon US][Amazon UK].) Graham is broadly in favour of inequality as he sees it largely an honest signal of different ability and willingness to create value for society.

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Very basic politics #5: why the rich tend to get richer

Whenever one talks of raising taxes and increasing benefits, a lot of people have this quite understandable reaction: “Why should people who work hard to earn money give it to people who don’t?”


But there is a good reason that every civilised country in the world[1] has a progressive tax system — one where people with high incomes pay a higher proportion of that income in tax[2]. It is that, other things being equal, there is a tendency for rich people to become richer and poor people to become poorer — and progressive tax systems are intended, at least, to ameliorate that tendency and prevent it from running wild.

But why does this tendency exist?

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Why I’m jealous of my eldest son

In his recent blog-post The pillars of tax wisdom, Tim Harford (author of The Undercover Economist) discusses “James Mirrlees — now a Nobel laureate — who tried to figure out what could be said about optimal income taxation. One of his conclusions, surprising to him as much as anyone else, was that an optimal income tax might impose flat or even falling marginal tax rates.”


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How to measure the strength of the economy, redux

Last month, I argued the point (admittedly at rather more length than necessary) that GDP does not measure what we’re interested in. I’m currently reading Tim Harford’s fascinating book The Undercover Economist [,] — which, by the way I highly recommend — and I was pleased to discover that he agrees with me.

UE reissue Bpb.indd

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Is the stock market zero-sum?

Suppose I buy a share in Microsoft from you at $400. Microsoft do well, and it increases in value to $500. At that point, I don’t want to push my luck any further, and sell my share for $500. It just so happens that you are the buyer.

In this scenario I have made $100 by “playing the markets”. But you have lost $100: you received $400 and paid $500, and ended up holding the same share that you started with. In effect, I have taken $100 from you. (Thanks!)

That was a zero-sum transaction, because your loss exactly cancelled out my win.

My question: is the whole stock-market zero-sum?