Poland is now among the world's 20 largest economies. How did it happen?

POZNAN, Poland — A generation ago, Poland rationed sugar and flour while its citizens were paid one-tenth what West Germans earned.

POZNAN, Poland — A generation ago, Poland rationed sugar and flour while its citizens were paid one-tenth what West Germans earned. Today its economy has edged past Switzerland to become the world’s 20th largest with over $1 trillion in annual output.

It’s a historic leap from the post-Communist ruins of 1989-90 to today’s European growth champion that economists say has lessons on how to bring prosperity to ordinary people — and that the Trump administration says should be recognized by Poland’s presence at a summit of the Group of 20 leading economies later this year.

The transformation is reflected in people like Joanna Kowalska, an engineer from Poznan, a town of half a million people midway between Berlin and Warsaw. She returned home after five years in the U.S.

“I get asked often if I’m missing something by coming back to Poland, and, to be honest, I feel it’s the other way around,” Kowalska said. “We are ahead of the United States in so many areas.”

Kowalska works at the Poznan Supercomputing and Networking Center, which is developing the first artificial intelligence factory in Poland and integrating it with a quantum computer, one of 10 on the continent financed by a European Union program.