The tax and benefit system is basically broken for couples with children

If you wanted to disincentivise work for the poorest, this is how you'd do it.

Last week, this IFS chart showing the effect of the child benefit withdrawal on marginal tax rates made quite an effect:

IFS Chart

I wrote about it myself, arguing that it underemphasised how bad the effect would be on families with lots of children. But the chart also plays down how bad the existing system is. The interplay between benefits, income tax and national insurance results in marginal tax rates which increase and decrease in a haphazard and unpredictable way, and frequently reach astronomic levels.

The IEA's Philip Booth looked at what he calls "the simplest possible case… of a couple with three children not claiming Housing Benefit, Council Tax Benefit or assistance with child-care costs (or a host of other ad hoc benefits that are available)." The figures were compiled in May last year, but are based on the state of affairs this May – so there may be some lags in exact amounts, but the overall picture remains accurate, at least pre-Universal Credit. Here they are charted in the same format as the IFS'

Chart Two

It's clear that for this case, the tax and benefit system is almost entirely backwards. The largest rates are paid at the bottom end of the income scale, progressively declining to 42 per cent, before finally, at the very top end, increasing to a "high" of 47 per cent.

And as Booth says, this is the simplest possible case. For someone in this situation claiming all the benefits they were entitled to, it's highly likely that at least one of the marginal rates would break 100 per cent – and that the tiny patch of 0 per cent at the very poorest end would disappear entirely.

While Bond and I agree on the problem, it's unlikely we would match minds on the solution. To me, the data above illustrates the fundamental folly of thinking that withdrawing benefits can ever really make economic sense. It is, prima facie, a strong argument for a Green-style citizen's income. Remove the conditionality from benefits and you have a system which encourages work at all income levels, rather than stamping on motivation the minute a family is no longer nominally "poor".

Raphaelle and Fabienne pose with one of their three children. Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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How the Lib Dems learned to love all-women shortlists

Yes, the sitting Lib Dem MPs are mostly white, middle-aged middle class men. But the party's not taking any chances. 

I can’t tell you who’ll be the Lib Dem candidate in Southport on 8 June, but I do know one thing about them. As they’re replacing a sitting Lib Dem (John Pugh is retiring) - they’ll be female.

The same is true in many of our top 20 target seats, including places like Lewes (Kelly-Marie Blundell), Yeovil (Daisy Benson), Thornbury and Yate (Clare Young), and Sutton and Cheam (Amna Ahmad). There was air punching in Lib Dem offices all over the country on Tuesday when it was announced Jo Swinson was standing again in East Dunbartonshire.

And while every current Lib Dem constituency MP will get showered with love and attention in the campaign, one will get rather more attention than most - it’s no coincidence that Tim Farron’s first stop of the campaign was in Richmond Park, standing side by side with Sarah Olney.

How so?

Because the party membership took a long look at itself after the 2015 election - and a rather longer look at the eight white, middle-aged middle class men (sorry chaps) who now formed the Parliamentary party and said - "we’ve really got to sort this out".

And so after decades of prevarication, we put a policy in place to deliberately increase the diversity of candidates.

Quietly, over the last two years, the Liberal Democrats have been putting candidates into place in key target constituencies . There were more than 300 in total before this week’s general election call, and many of them have been there for a year or more. And they’ve been selected under new procedures adopted at Lib Dem Spring Conference in 2016, designed to deliberately promote the diversity of candidates in winnable seats

This includes mandating all-women shortlists when selecting candidates who are replacing sitting MPs, similar rules in our strongest electoral regions. In our top 10 per cent of constituencies, there is a requirement that at least two candidates are shortlisted from underrepresented groups on every list. We became the first party to reserve spaces on the shortlists of winnable seats for underrepresented candidates including women, BAME, LGBT+ and disabled candidates

It’s not going to be perfect - the hugely welcome return of Lib Dem grandees like Vince Cable, Ed Davey and Julian Huppert to their old stomping grounds will strengthen the party but not our gender imbalance. But excluding those former MPs coming back to the fray, every top 20 target constituency bar one has to date selected a female candidate.

Equality (together with liberty and community) is one of the three key values framed in the preamble to the Lib Dem constitution. It’s a relief that after this election, the Liberal Democratic party in the Commons will reflect that aspiration rather better than it has done in the past.

Richard Morris blogs at A View From Ham Common, which was named Best New Blog at the 2011 Lib Dem Conference

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