After all, there should be a process that works through world financial markets to allow savers in one country to lend to borrowers in another. Such a process supports higher global growth, since countries with surplus savings can invest them in countries that do not save enough internally. Within national borders, regional savings-investment imbalances emerge all the time.
And we don't normally worry about them because there are effective market-based mechanisms in place that work to resolve them. Relative wages and prices change, as do relative returns on capital. This causes a movement in the real exchange rate between regions, which then provides an equilibrating mechanism. The ability of labour to move within a country helps to promote an orderly adjustment process.