Consumer spending drives economic growth.
The lego store makes money, its employees keep their jobs and spend more, other stores can hire more people, spending rises, demand rises, so production rises and factories hire, more people spend more, more people are hired by businesses to create, sell, transport, or manage, eventually the tertiary employers, government-run business dependent on tax money for their budgets, can hire more. Then it all collapses, because government jobs reduce overall productivity.
Also, the relationship between government and economy in Eastern Europe is the chief impediment preventing it from experiencing prosperity. The legacy of the command economy. Both in terms of an over-inflated government sucking up GDP, and in terms of the slow development of entrepreneurship and lack of capital.
But it'll come. It takes time, and many hard decades, for the spirit of entrepreneurship to emerge out of desperation (and that is how the will to be prosperous is created).