The "light-bulb moment" that sparked Dayna Boyer's entry into the sharing economy came when she wanted a juicer.

She loves cooking, but as someone who has lived much of her adult life in small apartments and condos, she's never had an overabundance of space for specialty kitchen appliances. Nor had she the finances to buy the pricier ones.

The World this Weekend Thousands of people list their apartments or homes for short-term rentals on Airbnb. And in New York, it's especially popular. But while renters and travellers love the service, many people do not, and they're all trying to figure out how to navigate the law. Hear Colleen Ross's report on Airbnb on The World This Weekend on Sunday, April 20 at 6 p.m. ET (7:30 p.m. NT) on CBC Radio One or on Sirius at 6 p.m. and 9 p.m. ET.

Still, she had her eye on a juicer. Anyone she talked to told her the same thing, though: "You'd use it for a month and then it would sit in your cupboard collecting dust, taking up space and you'd never use it again."

Then the light bulb went off. Maybe there would be virtue in offering a service where people could borrow or share for a time — for a modest annual fee — kitchen appliances they might not have the space to store, the money to buy or the need to possess full-time on their own.

"Finances and space don't need to be barriers to healthy cooking," says Boyer, founder of the Kitchen Library, which opened its doors in east-end Toronto last fall and now has about 50 appliances on its roster.

In launching the Kitchen Library, Boyer became a participant in what has become the sharing economy, a worldwide phenomenon that has turned the age-old practice of sharing into an internet-fuelled economic juggernaut worth many billions.

"Anything connected to the sharing economy is very exciting," says Boyer. "It's such a growing industry."

Share a pooch

From car and bike sharing services that now dot some of the world's larger cities to the high-profile Airbnb that helps travellers find overnight rooms in homes worldwide, the sharing economy has become an economic entity the Economist magazine and others have noted could be worth $25 billion or more.

One study out of the U.K. puts the estimated annual value of the global sharing economy at more than $533 billion, and 1.3 per cent of that county's GDP.

Some sharing services are decidedly personal, such as the ones that give pet-starved people, who may not want the full-time responsibilities of walking a dog, the chance to spend some quality time with a cheerful pooch.

Other initiatives are more institutional, like perhaps helping municipal governments or downsizing corporations find ways to share underused assets such as space. Still others give people a chance to share skills or outsource errands.

"There isn't a single sector that hasn't been affected by this," April Rinne, chief strategy officer of the consultancy the Collaborative Lab in San Francisco, said in an interview on CBC's Metro Morning earlier this year.

In Vancouver, the three-year-old Tool Library has grown to include more than 800 members who have access to more than 1,000 tools.

"I think people really got behind the idea that they didn't need to own the tool, they needed access to it," says co-founder Chris Diplock, who has led research into the sharing economy in Vancouver.

Blame the internet

Recently, however, there has been some debate over whether the sharing economy is a good thing, whether sharing goods and services is a practical, money-saving venture, or merely a way to exploit those who need to rent some of their belongings out of economic need, particularly since the economic downturn in 2008.

But whatever its merits, there's no doubt the rise of the modern sharing economy is a result of an evolution in the way people communicate.

"To the extent we have things that are valuable to other people, then digital technology is going to make it easier to share things," says Avi Goldfarb, a professor of marketing at the University of Toronto's Rotman School of Management.

"This idea goes back a long way in terms of the internet. Now, we think about the sharing economy as being about hotels and car services and that kind of thing. But if you think about the early days of eBay, in many ways it was the same idea, which was that people had junk in their basements and they went to eBay to sell it to other people who might have found value in that junk."

Lorraine Rorke Bader arranges fresh flowers in a room at her home before an overnight guest arrives in San Francisco, where legislation would make it legal for city residents to rent out their homes on sites such as Airbnb, but only if they have liability insurance and meet other requirements. (Paul Chinn/San Francisco Chronicle/Associated Press)

​Goldfarb doesn't subscribe to the theory that the sharing economy could be fuelled significantly by the most recent economic downturn and people turning to sharing because they have more limited financial resources.

"We've had recessions before and we didn't suddenly have people renting out rooms in their apartments as hotel rooms," he says.

"What's really changed is technology makes it much easier for these people to find each other."

For Boyer, social media and online conversation have been a "cost-effective way of reaching out and letting people know what we're doing."

And that's not just offering people the chance to borrow a dehydrator, canner or — when the weather gets warmer — an ice cream maker.

The Kitchen Library, which shares space with the similarly spirited Toronto Tool Library, has been offering sessions for people on topics such as pasta making.

"Workshops have actually been more popular than I originally thought," says Boyer.

"I thought what I was just offering was a lending library of appliances. But it's actually turned into a big opportunity to build a community around food and food education."

Lawmakers taking notice

But as easy as it has become to find someone online who has something you might want to share or rent, there are limitations on just how far the sharing economy goes, particularly when it comes to new regulations on transactions that have, until now, largely flown under the legal radar.

"It the regulators don't decide to stop it, then it's going to continue to grow," says Goldfarb.

Last year, for example, two Quebec homeowners were ticketed for renting out rooms to tourists without a permit.

"It’s a worrying trend….We should be thinking about protecting the hotel industry and preventing tax evasion," Quebec's tourism minister at the time said. "But, at the same time, we have to realize that people want to travel in different ways."

This week, San Francisco lawmakers served notice that they are considering making it legal for city residents to rent out their homes on websites such as Airbnb, but only if they have liability insurance and meet other requirements.

People stop by the Danforth Avenue location of the Toronto Tool Library on April 12, 2014, to check out a session held by Repair Cafe Toronto. (Bruce Reeve/CBC) On its website, Airbnb warns hosts to be aware of the laws in their city, noting that some restrict people's ability to host paying guests for short periods.

While Airbnb has been at the forefront of the sharing economy, Boyer wants to look beyond such services and sees great potential for its growth.