How does overregulation stifle economic growth? The latest Bloomberg Businessweek offers an example from France.

Here’s a curious fact about the French economy: The country has 2.4 times as many companies with 49 employees as with 50. What difference does one employee make? Plenty, according to the French labor code. Once a company has at least 50 employees inside France, management must create three worker councils, introduce profit sharing, and submit restructuring plans to the councils if the company decides to fire workers for economic reasons.

French businesspeople often skirt these restraints by creating new companies rather than expanding existing ones. “I can’t tell you how many times when I was Minister I’d meet an entrepreneur who would tell me about his companies,” Thierry Breton, chief executive officer of consulting firm Atos and Minister of Finance from 2005 to 2007, said at a Paris conference on April 4. “I’d ask, ‘Why companies?’ He’d say, ‘Oh, I have several so that I can keep [the workforce] under 50.’ We have to review our labor code.”

While polls show job creation and the economic crisis are the top issues for voters in the May 5 second-round vote for president, neither President Nicolas Sarkozy nor Socialist challenger François Hollande are focusing on Breton’s concern. Companies say the biggest obstacle to hiring is the 102-year-old Code du Travail, a 3,200-page rule book that dictates everything from job classifications to the ability to fire workers. Many of these rules kick in after a company’s French payroll creeps beyond 49.