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RPT-COLUMN-Undermining half the 30-year bond bull run: Mike Dolan

(Repeats column that ran earlier on Friday, with no changes)

By Mike Dolan

LONDON, July 15 (Reuters) - A more insular world economy will come at a high price if the era of global currency reserve building follows globalisation into reverse.

By some estimates, it could risk up to half the bond bull run of the past 30 years and usher in a protracted period of higher borrowing costs for all.

It doesn't take much imagination to cook up a scare story on interest rates right now. Betting on higher borrowing costs right now hardly requires a doctorate in economics.

Inflation and interest rates are soaring post-pandemic, spurred further by the energy and commodity price shocks from the Ukraine invasion. The U.S. Federal Reserve is going into overdrive to rein in 40-year-high consumer price rises and the dollar exchange rate is electrified across the world.

Guessing how that pans out over the next 12 months or so requires the dexterity of everyone from Fed-watchers to Kremlinologists. While they work it out, financial asset prices are in retreat everywhere - with few places to hide.

But the eventual landing zone for the world economy and global asset prices depends significantly on the extent to which decades of globalisation of trade and investment, which underscored one of the most spectacular financial market booms in history by pooling world savings in 'safe' bonds, has already crested and is now in irreversible retreat.

Many economists are calling time on this period after four years of serial disruptions - from Washington's trade wars under Donald Trump, to COVID lockdowns or health protectionism, and now a revival of Cold War politics and realignment of economic alliances following Russia's attack on Ukraine.

The precise cost is a fuzzy concept. But some are taking a stab at it.

In their annual Equity-Gilt Study of global asset price research released this week, Barclays economists dwell heavily on the theme of 'de-globalisation' - especially the rethink of cross-border supply chains, investment and borrowing amid a rash of 'on-shoring', 'near-shoring' or even 'friend-shoring'.

They paint an "era of instability" ahead as we wave goodbye to "The Great Moderation" of prices, wages and interest rates associated with years of expanding trade and access to world labour markets -- and also a potential revival of macro volatility due to the return of clumsy inventory management following years of 'just-in-time' supply chains and shipping.

But in a special chapter on a possible peak in central banks' hard currency reserves - one of the most obvious components of the so-called 'global savings glut' depressing borrowing rates for decades - the study puts a basis point estimate on the sort of risk ahead.