It all begins with the tap of a keyboard or the touch of a screen.

That simple action, repeated tens of millions times a day by online buyers, sets in motion an back economy racing to get a package to a door. The Lehigh Valley is at the center of that economy.

And that economy is exploding.

Consumers this year spent $5 billion online during the post-Thanksgiving Black Friday/Cyber Monday shopping spectacular, according to Adobe Digital Insights. That was 12 percent more than last year.