"We argue that such a lengthy period of uncertainty is not at all helpful to businesses seeking to make investment decisions or indeed the wider economy of the UK, " the letter states.
BBC: Heathrow: Cross-party calls to speed up Davies Commission
In its report, PwC said that the level of global growth could increase by around as much as 3.7% by the extra supply of shale oil, which is the equivalent of adding an economy roughly the size of the UK to the total world economy by 2035.
"There is a risk that introducing a border will reduce trade, and this would impact much more seriously on the Scottish economy than on the economy of the rest of the UK, " write Swales and McGregor.
The Tories attacked the Labour-Plaid Cymru coalition government following the publication of economic indicators that place the Welsh economy at the bottom of the UK league despite significant investment.
Stand by for the latest utterances of the IMF about the state of the UK economy to be scoured for evidence of support for the government's Plan A or backing for Labour's calls for a Plan B.
You might have hoped that a more than 20% fall in the value of the pound during the financial crisis would have been enough to help us start to re-balance the UK economy - boosting the competitiveness of UK plc, and so reducing the gap between our exports and our imports.
Which - again depending on where you sit on the spectrum of enthusiasm for liberal markets - will either reinforce the global competitiveness of the UK economy, by showing that we are the most welcoming home for mobile investment capital, or will erode our ability to determine our economic future.
The talks are part of the IMF's annual review of the UK economy, and will involve meetings with the Treasury, the Bank of England, the Office for Budget Responsibility, and independent economists.
Economists believed the underlying strength of the UK economy would help the Scottish economy to also avoid a recession.
Sir Mervyn King, the governor of the Bank of England, said on Wednesday that while there were some signs of optimism for the UK economy, the rising cost of living would remain stubbornly high for some time.
Second, the UK has a currency that adjusts to the competitive strength or weakness of the UK economy alone, whereas - arguably - the exporting businesses of Spain and Italy are forced to sell overseas at higher prices than they would ideally like because the euro's value is determined by the perceived robustness of Germany's formidable manufacturing capacity.
The introduction of a graduate tax would undermine the competitiveness of the UK economy, say business leaders.
The retail data raises concerns about the strength of the UK economy, which shrank by 0.3% in the fourth quarter of 2012.
Indeed, the total debts of the UK's banks had already reached a staggering 4.5 times the size of the entire UK economy before the crisis.
But if we assume that we had too many eggs in the energy and finance baskets, and these sectors will continue to shrink for years as a proportion of the economy, what does the UK look like without them?
The services sector is seen as a good indicator of the health of the wider economy as it accounts for about three-quarters of the UK's GDP.
The economy even outperformed the rest of the UK in growth and factory output - an impressive boast, considering that political uncertainties have held back growth of private companies.
After Tuesday's Fed rate cut - its third rate cut this year - most experts believe that another UK rate cut in on the cards - although the Bank will be careful to point out that it takes decisions on the basis of the situation of the UK economy.
It's worth remembering that determined efforts by the Bank of England to bring down the real cost of borrowing did turn the economy around after 1932, when the UK confronted a similar double dip recession - in the wake of another major European crisis, centred around banks.
The Strathclyde University economists who carried out the survey said the Scottish economy could outperform the UK economy with GDP growth of 1.3% compared with an average of 1.1% growth in the country as a whole.
Not only has the ease of online shopping persuaded people to stay at home, but the recession and stagnation of the UK economy has left people with less money to spend when they do hit the shops.
In two and half years of "recovery", the UK economy has recovered only 45% of the output lost during the recession.
We'll see how 2010 measured up for the Welsh economy compared with other parts of the UK at half past nine tomorrow.
The Office for Budget Responsibility report - published twice a year - is its assessment of the UK economy's likely performance over the next five years.
But in the big public arguments with Labour about austerity, growth, and the underlying potential of the UK economy, Robert Chote continues to offer the Chancellor invaluable support.
Right now they seem most focussed on the many things they don't know about the current functioning of the UK economy and its financial system, and the many events that they find impossible to predict.
Math and engineering are of major importance to the success of the marketing sector and the UK economy.
With a weak recovery to start 2013, "Fitch has not revised its previous judgment that the potential annual growth rate of the UK economy is around 2.25 percent, " the statement said.
Later, in a speech to delegates, Mr Balls accused the government of damaging the UK economy through its focus on deficit reduction.
"This network would help the UK to develop the type of 'knowledge economy' that is essential if the UK is to remain competitive in the future, " BT said in a statement.
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