The Silk Commission is due to publish its first report on 19 November, looking at whether the Welsh government should be made more accountable for the money it spends by devolving tax-varying powers.
Prof Kemp, an expert in North Sea oil and gas exploration economics, also said devolving tax policies would create the complicated situation of separate taxation regimes in Scottish and the rest of the UK's waters.
And it brings to mind a highly controversial piece of economic work by Professors Andrew Hughes-Hallett and Drew Scott, published last year, which argued that the act of devolving tax power in itself can drive up growth rates, at least temporarily.
By sending a letter to the Chancellor calling on him to press ahead in full with the Silk Commission recommendations, any ambiguity - if there was any - about how far the Welsh government wants to go with devolving tax and borrowing powers is removed.
Labour's commission, which includes MPs, MEPs, union members and academic advisers, said there was a case for devolving income tax but there are big caveats.
Devolving the tax powers has all-party support at the NI Executive.
Swales and McGregor are concerned about the difficulties of devolving more tax powers within a unified state, and highlight the flexibility the Scottish Parliament already has.
But it rules out devolving corporation tax unless it is also devolved to Scotland and Northern Ireland, national insurance, capital gains tax, VAT and fuel duty.
BBC: Commission calls for Welsh government income tax powers
Last month, it published a consultation document on devolving corporation tax to Holyrood, but with a conspicuous lack of any reckoning on its likely or possible impact.
The day before Mr Miliband's speech, Scottish Labour announced details of a commission which said there was a "strong case for devolving income tax in full" to the Scottish Parliament.
With Mr Paterson now moving on to tackle issues like the European Common Fisheries policy at the department looking after the Environment and Rural Affairs, the campaign for devolving Corporation Tax loses its most vocal champion.
His test, said Mr Cameron, remained the same as ever: would devolving any powers over tax be good for Wales and those who live and work there.
Mr Maragall, four times mayor of Barcelona, would go further, guaranteeing town halls too their share of the tax take, and devolving responsibility for primary schools to them.
First Minister Carwyn Jones AM has also proposed devolving control of some taxes, though not income tax.
On Tuesday, Northern Ireland's first and deputy first ministers met the prime minister over devolving the power to set the rate of the tax.
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