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A recent analysis by Goldman Sachs says the last time valuations were so high for so many parts of the market-including stocks, bonds and credit-was 1900.

That figure should be startling to anyone invested today looking for return tomorrow.

Recently I wrote to you about Jack Bogle and his predictions of 4% returns for some time. Even those may be too optimistic in the future reality painted by Goldman. Bloomberg reports:

A prolonged bull market across stocks, bonds and credit has left a measure of average valuation at the highest since 1900, a condition that at some point is going to translate into pain for investors, according to Goldman Sachs Group Inc.

โ€œIt has seldom been the case that equities, bonds and credit have been similarly expensive at the same time, only in the Roaring โ€™20s and the Golden โ€™50s,โ€ Goldman Sachs International strategists including Christian Mueller-Glissman wrote in a note this week. โ€œAll good things must come to an endโ€ and โ€œthere will be a bear market, eventuallyโ€ they said.

As central banks cut back their quantitative easing, pushing up the premiums investors demand to hold longer-dated bonds, returns are โ€œlikely to be lower across assetsโ€ over the medium term, the analysts said. A second, less likely, scenario would involve โ€œfast pain.โ€ Stock and bond valuations would both get hit, with the mix depending on whether the trigger involved a negative growth shock, or a growth shock alongside an inflation pick-up.

Read more here.