chatter for some weeks now.

The idea is that a successful vaccine rollout,

pent-up demand, aggressive fiscal stimulus,

and a central bank that is willing to let the economy run

hot will lead to a jump in growth

and rising prices across the economy.

We can see how enthusiastically investors have jumped

on board with the notion of a reflation trade

by looking at the spike in 10-year Treasury yields

since the autumn, and in particular,

since the beginning of February.

Consider also investors' expectations for inflation

over the next five years, which are

now back to their pre-pandemic levels,

judging by the difference between inflation-protected and

nominal Treasury yields.

In the stock market reflation mania

has taken the form of a major rotation between sectors.

The big winners of the last decade - expensive,

high-growth tech stocks - are suddenly out of favour,

while long-shunned, economically sensitive,

low-growth value stocks, from banks to materials companies,

have surged ahead.

Here is a chart of the performance of the Russell 3000

Growth and Value Indices.

Any time the market coalesces around a single consensus

view a bit of scepticism can be useful.

Anyone who thinks we are going to exit the Covid crisis

on a fundamentally different macroeconomic trajectory

than we entered it would do well to look again

at those 10-year Treasury yields,

but this time over a 30-year period.

That recent leap in yields?

It barely registers.

Are the forces that have driven interest rates down

over a period of decades really going

to reverse because of the pent-up demand

from the pandemic and some government stimulus?

Remember also that years of low interest rates

have driven asset prices to dizzying highs.

A jump in inflation could reverse that process

and drive the economy back down towards deflation.

This is not just a point about the stock market.

The value of US housing stock rose by $2.5tn in the pandemic

year of 2020, according to Zillow, to reach $36tn,

driven largely by falling mortgage rates.

An increase in interest rates could cause housing prices

to tumble, creating a massive wealth effect that

would stifle consumer spending.

High asset prices, like the ones we have now,

make growth fragile.

Do not take the reflation trade too far.