(The opinions expressed here are those of the author, a

columnist for Reuters.)

By Jamie McGeever

ORLANDO, Florida, May 5 (Reuters) - A virtuous cycle is

building on Wall Street. Sky-high expectations for corporate

earnings growth and investor returns are driving benchmark

indices into the stratosphere, pushing investor bullishness even

higher.

Is this the "boom loop" that Bank of America analysts have

coined - or is it sowing the seeds of an inevitable reversal

that could trigger a potentially turbulent "doom loop"?

It depends on how investors interpret the signals.

Below is a series of charts and graphics highlighting a few

key trends behind today's eye-popping headline index numbers. Do

these stretched metrics indicate that the market is dangerously

overvalued, or do they signal that we're in the early stages of

an artificial intelligence-fueled hyper-bull market?

That's the trillion-dollar question.

ULTRA-LOW DIVIDEND YIELDS

The S&P 500 dividend yield - total dividends divided by the

value of the index - is currently just 1.1%, barely 50 basis

points off the lowest level in a half century and the lowest

since 2000.

A higher S&P 500 dividend yield typically indicates that the

index may be cheap, and vice versa. But a lower yield may also

simply reflect the fact that dividends make up a smaller share

of investors' total returns than in the past.

Regardless, it certainly suggests that U.S. equities are

pricing in a lot of optimism. As a reminder, the last time

dividend yields were this low was 2000, when the dotcom bubble

burst.

SKY-HIGH EARNINGS ESTIMATES

The degree to which the U.S. earnings outlook has brightened

in recent weeks is astonishing. First-quarter earnings per share

(EPS) growth is now projected at nearly 28%, according to LSEG

I/B/E/S, almost double the 14.4% consensus forecast on April 1.

Big tech is responsible for much of that. Communication

services earnings are expected to rise over 55% from the fourth

quarter of last year to almost $100 billion in the first three

months of the year. Information technology is expected to grow

nearly 52%, lifting earnings to over $189 billion.

The latest boost to full-year 2026 earnings, however, comes

courtesy of the energy sector, where analysts are expecting over

46% EPS growth this year. On April 1, the consensus estimate was

18%, and on January 1 it was under 8%.

NEGATIVE EQUITY RISK PREMIUM

The so-called "equity risk premium" - the difference between

equity yields and bond yields - has fallen below zero and is now

the most negative since July last year, fast approaching the

2024 low of minus 0.7%. The last time the ERP was more negative

was 1999.

A negative ERP can be interpreted as a sign that stocks are

expensive or that bonds are cheap. Or both. Of course, prices

may not be stretched at all if they are supported by sound

fundamental reasons.

What's the current verdict? Again, it depends on whether you

buy the narrative that the AI tech boom will continue driving an

earnings bonanza.

RECORD-BREAKING AI CAPEX

The U.S. is undergoing one of the biggest corporate

investment booms in history, as the megacap hyperscalers build

the infrastructure that will underpin the AI revolution. Today's

buildout is bigger than the Space Race or the Manhattan Project

and is reminiscent of the railroad boom in the 19th century.

Forecasts on how high this spending will go were already off

the charts, but analysts at Morgan Stanley and Goldman Sachs

just raised theirs even higher.

Morgan Stanley's team now sees the five major U.S.

hyperscalers' AI capex topping $800 billion this year and $1.1

trillion next year, up from previous forecasts of $765 billion

and $950 billion, respectively. Goldman's analysts expect

cumulative AI infrastructure spending to hit a whopping $7.6

trillion by 2031.

These astounding figures underpin both the bullish and

bearish market takes.

The bull asks how investment on this scale can create

anything other than a record-breaking run on Wall Street?

But the bear questions how it will be funded, and, more

importantly, whether these gargantuan outlays can possibly

generate a sufficient return on investment.

The answers to those questions will largely determine how

Wall Street and the U.S. economy fare in the years ahead.

(The opinions expressed here are those of the author, a

columnist for Reuters)

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(By Jamie McGeever

Editing by Marguerita Choy)