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For the past six years in a row, the World Bank has rated the Southeast Asian city-state of Singapore as the easiest place in the world to do business. Drawn in part by this reputation, money and talent are pouring into the island nation's growing technology sector.

One of Facebook's co-founders recently renounced his American citizenship and relocated to Singapore, where he has been investing in tech startups.

One of these firms is Perx, co-founded by former New Jersey resident Andrew Roth.

At a coffee shop near his office, Roth demonstrates how the business works, by buying a couple of lattes. After paying for the coffee, the cashier shows Roth a printed symbol called a QR code. Roth uses his smartphone to scan the code. It's the digital equivalent of earning a stamp on a loyalty card, which, when full, can be redeemed for rewards.

"There are so many apps in the market right now ... that just kind of serve the consumer," Roth says. "And we took the approach with Perx to help the merchant first."

Roth says Singapore is an important test market for his company because it is the regional base for many multinationals. He plans to expand into Indonesia and other Southeast Asian markets in the future.

Since launching last year, Perx has added 60,000 registered users who have accumulated 250,000 digital stamps. Companies from Dunkin' Donuts to Procter & Gamble pay Perx a monthly fee to advertise and reward loyalty.

"We found a lot of research telling us that people really don't feel loyal to the company where they have a loyalty card," Roth says, adding that Perx aims to change that.

Facebook co-founder Eduardo Saverin has invested an undisclosed amount of money in Perx, and is set to join the startup's board of directors. Saverin declined to be interviewed.

Virginia Cha, a tech industry specialist at the National University of Singapore, says that both venture capitalists and Singapore's government have been plowing money into tech startups, setting the stage for technical innovation.

"We've been seeing quite a few expat entrepreneurs coming to Singapore, setting up shop and raising funding here," she says. "So it's an easy environment to get started, especially since there's a lot of money now."

Cha cautions that ideas and products that work in Singapore — an island city of 5 million — will not necessarily work elsewhere.

But Cha herself is also an investor, betting on home-grown startups and cutting-edge technological applications.

"You need to have a killer app," she argues. "And so far the killer apps have come from the United States: Twitter, Facebook. We need a killer app that's created right here in Singapore."

Cha says investors like her are interested in more than just software. They're envisioning the future and betting that they can make it a reality.

For example, she points to a startup called Good For Us, which aims to inform consumers about the ethical implications of their purchases. Clive Wright, the chief business strategist for Good for Us, says his company uses data from environmental and human rights NGOs to rate corporations' ethics.

"How do I know if what I'm buying is produced and distributed in an ethical way?" he asks. "How do I know if the company that I'm dealing with actually deserves my money?"

Singapore serves as the nerve center for the company's global operations. Wright's technology specialist, a Scottish expat named Ian Morrison, is developing the company's software in Vietnam.

"Singapore is very much a digital hub for the world," Morrison says. "We have access to the very best education, the very best technology, the very best infrastructure."

Morrison is just one of the company's remote employees linked to its nexus in Singapore.

"Ian is a classic example," Wright says. "He has a development team in Vietnam. So through him, we are virtually in Vietnam as a business. Jim is in Geneva, and through him, we are connected to the global NGOs."

In that sense, Wright says, Singapore increasingly resembles Geneva, a place where companies go to establish regional headquarters.

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