Uber Technologies Inc. and Airbnb Inc. have set their sights on global expansion. They’re about to face a global response.

Mayors from New York to Paris to Seoul think they’ve found the trick to coping with so-called “sharing economy” apps — working together. Ten markets are jointly preparing a unified rule book in a bid to leverage their combined size to promote clearer ground rules.

These companies have been used to dealing with regulators, but they’ve done so mostly on a city-by-city basis. That’s about to change: Representatives for cities that also includes Athens, Barcelona and Toronto, have started their first concerted effort to produce a common framework. While there’s no white paper or policy drawn up yet, multiple city representatives met for the first time last month in Amsterdam to discuss. Paris is calling for a first publication by October.

“Having the 20 or 30 biggest urban markets of the world all operating under entirely different rules doesn’t do much good for anyone,” said Wiley Norvell, spokesman for New York Mayor Bill de Blasio’s deputy for housing and economic development. “We want consumers and tourists to have some consistency, city to city,” he said, to “leverage the size of markets, which together are enormous, so that the voice of cities will actually make an impact.”

Regulation is one of the biggest hurdles for companies like Uber and Airbnb as they expand. They need to convince lawmakers to side with them amid backlash from well-established, more traditional competitors, and debate about the apps’ impact on cities. Both companies have separately argued that their applications have a positive influence on cities or create jobs and pledged to negotiate with officials to ensure their businesses fall on the right side of local laws.

Riots, Fines

“We’re all grappling with the same issues around safety, equity, economic opportunity, and sustainability,” Norvell said about the world’s biggest markets for these apps.

Until now, responses from governments have been uneven.

In New York, challenges have ranged from a lawsuit that accuses Uber of running an antitrust scheme, to criticism over Airbnb becoming a platform for unregulated hotels. In France, Uber has faced everything from rioting amid taxi strikes to its executives being fined by a judge, although Airbnb has had a smoother ride there so far. Other places including Lisbon have taken steps to ease regulation.

New York’s de Blasio has discussed the pros and cons of sharing economy services with several mayors, including Paris chief Anne Hidalgo last year. Balancing local housing needs and new services for tourists is one aspect she’s especially concerned with, said Ian Brossat, who’s in charge of that issue for the French capital.

A spokesman for Uber declined to comment.

A spokesman for Airbnb said via e-mail the company would “welcome any chance to educate more cities about the benefits of home sharing and look forward to continuing to work with officials around the world.”

“Airbnb has collected $85 million in taxes and helped thousands of people pay their bills and stay in their homes,” he said. “Every city is different, but we’ve seen how cities around the world are embracing Airbnb and we will continue to partner with individual cities to address their unique policy needs.”

New Regulation

Paris, Airbnb’s most popular destination, is also one of the places where it has managed to appease regulators by doing as hotels do and collect a tourist tax on behalf of the city — it announced this week the collection process would apply to 18 further cities in the country from August.

“Our agreement with Airbnb on collecting tourist tax is positive, but they can’t buy us,” Brossat said. “We can’t remain inactive or entire neighborhoods won’t have a single home left for locals to rent. This is another issue we have to sort out with Airbnb.”

Airbnb collected 4.7 million euros ($5.3 million) in tourist tax last year in Paris, according to Brossat. That hasn’t stopped the French capital from pushing for new regulation at home seeking to address broader issues of taxes payable by individuals renting out their properties.

“It’s not about being anti-innovation,” Brossat said. “Regulation is necessary in this field and I think we’re at a tipping point — public opinion is starting to understand that. It’s the right time to make a change.”

–With assistance from Charles Penty, Alison Vekshin, Eric Newcomer, and Maria Tadeo

©2016 Bloomberg L.P.

This article was written by Marie Mawad, Henry Goldman and Helene Fouquet from Bloomberg and was legally licensed through the NewsCred publisher network.

Photo Credit: Striking taxi drivers in Paris, France, Thursday, June 25, 2015. Major cities across the world are teaming up to share best practices for dealing with Uber and Airbnb. Michel Euler / Associated Press