This is a passenger announcement. You can now book your train on Uber and get 10% back in credits to spend on Uber eats.

So you can order your own fries instead of eating everyone else's.

Trains, now on Uber. T's and C's apply.

Check the Uber app. The Economist.

From The Economist in London, this is Money Talks, a weekly conversation around themes in the worlds of business, finance and economics.

I'm Stan Pagnell, the banking editor.

On Monday, British lawmakers voted in favor of taxes on sugary drinks.

It's all part of a wider set of measures to curb obesity, particularly among children.

To some, the syntaxes, which already exist in the case of alcohol or cigarettes, for example, are a sensible way to curb future health care costs.

Other see them as the Nanny State gone rogue and wonder when compulsory gym classes will be

introduced to keep us all healthy.

But do these taxes work? And if so, what can they teach us about curbing

other undesirable behaviors, whether it be using plastic bags or indeed emitting greenhouse

gases into the atmosphere? Today I'm joined by Sumaya Keynes, our economics correspondent, and

Edward McBride, who edits the finance and economics section. And Sumaya, you have looked at

taxes on sugary drinks specifically, and you found that indeed they have the effect that you would expect them to have.

Yeah so one of the more recent examples is a tax on sugary drinks that was introduced in

Mexico at the beginning of 2014 and the early evidence seems to suggest

that it has been effective in cutting consumption.

So one paper found that consumption fell by around 6% relative to previous trends.

The other concern that people have when thinking about these taxes is that retailers

might not pass on the tax to consumers in the form of higher prices.

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