NEW YORK (TheStreet) -- Near the peak of the dot-com bubble I did a piece for Salon on daytraders.

I focused on the difference between those who were disciplined about taking nickels-and-dimes from price movements, against those who fell in love with their holdings and lost money.

In fact it was a classic

John Henry story. The history of American business is a John Henry story. Progress lies in replacing people with machines. Those who do this pocket the profits. The rest of us pocket the value.

Today that daytrading floor is as dead as John Henry's job of driving spikes on a railroad. Software rules. Those nickels-and-dimes go to algorithms, from high-frequency trading outfits like

Getco

, which now wants to take out the rest of market maker

Knight Capital

(KCG)

for what

I think is a dirt-cheap price.

If you want to know how the business world works, look at who is buying the sports teams. Joe Ricketts automated stock trading at what's now

TD Ameritrade

(AMTD) - Get Report

, turning thousands of brokers out of work, and then bought the Chicago Cubs,

as

Bloomberg

reported. Dan Gilbert automated mortgage lending with

Quicken Loans, turning thousands of mortgage brokers out of work, then

bought the Cleveland Cavaliers, according to Quicken PR.

Arthur Blank automated home improvement logistics at

Home Depot

(HD) - Get Report

, putting thousands of middlemen out of work, and now, as my

Atlanta Business Chronicle

reported a decade ago, he owns the Atlanta Falcons.

What all these stories have in common is that they put office workers out of work. Middlemen everywhere are being replaced with scaled computing. Outer-ring suburbs, from which these people long commuted to work at downtown offices, are becoming the new Rust Belt.

Factories came back, of course. But people had been replaced by robots on those lines, putting big profits into the hands of factory owners, while creating enormous new value for consumers. It's in spending this value that we've created armies of dog walkers, yoga instructors and artisanal cupcake bakers.

What should investors take away from all this? Put your money into companies creating this new value, companies like

Stratasys

(SSYS) - Get Report

and

3D Systems

(DDD) - Get Report

that are turning hand-work into printing.

Look for the next hot IPO, to a company like

Makerbot, which is bringing this revolution to small businesses and consumers much as kids like Steve Jobs of

Apple

(AAPL) - Get Report

and Bill Gates of

Microsoft

(MSFT) - Get Report

automated office work when I was going to college.

These are early days. You can make 3D printing a nano-scale technology, as with these devices for catching single cells from the Netherlands,

at

3Ders

. If you want your kid to be the next Jobs, or the next Gates, teach them science and engineering. Tell them to get their hands dirty.

I'm not the only person who believes this. Old China hand James Fallows at

The Atlantic

sees it

bringing manufacturing jobs back to America.

Note too that Makerbot is based in Brooklyn, a few blocks from the new home of the Brooklyn Nets. It's a sign. Value creation is moving from sleek office towers to live-work spaces in lofts and abandoned factories, from Manhattan to Brooklyn (and Queens).

Put your money into creating new value, into replacing people with machines so we will have new jobs doing what even robots can't. Don't be John Henry.

At the time of publication, the author was long HD, AAPL, MSFT and DDD.

Follow @DanaBlankenhorn

This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.