How did laissez faire government policies encourage growth?

It allowed businesses to operate with less regulation

The economic system of laissez-faire has several elements:

1) respect for private property

2) freedom to start and own a business

3) free markets in trade (that is, no government price controls or excessive intervention)

These government policies encouraged growth because the government took a step back from the businesses and people can now live so much easier, without worrying about the government collecting the food or stuff they make.