is is not a durable solution to the challenge of sustaining global demand

Primeiro a curiosidade, neste artigo de Martin Wolf no Financial Times "Global imbalances threaten the survival of liberal trade"
.
Olhando para o gráfico de barras da direita e perceber o peso percentual, em função do PIB, do nosso défice de transacções com o exterior.
.
Depois o essencial do artigo:
.
"So where are we now? With businesses uninterested in spending more on investment than their retained earnings, and households cutting back, despite easy monetary policy, fiscal deficits are exploding. Even so, deficits have not been large enough to sustain growth in line with potential. So deliberate fiscal boosts are also being undertaken: a small one has just been announced in the UK; a huge one is coming from the incoming Obama administration.
.
This then is the endgame for the global imbalances. On the one hand are the surplus countries. On the other are these huge fiscal deficits. So deficits aimed at sustaining demand will be piled on top of the fiscal costs of rescuing banking systems bankrupted in the rush to finance excess spending by uncreditworthy households via securitised lending against overpriced houses.
.
This is not a durable solution to the challenge of sustaining global demand. Sooner or later – sooner in the case of the UK, later in the case of the US – willingness to absorb government paper and the liabilities of central banks will reach a limit. At that point crisis will come. To avoid that dire outcome the private sector of these economies must be able and willing to borrow; or the economy must be rebalanced, with stronger external balances as the counterpart of smaller domestic deficits. Given the overhang of private debt, the first outcome looks not so much unlikely as lethal. So it must be the latter."