olivia sterns reports. >> andrew knowles' summer has been anything but lazy. >> as you can see, very busy in may. i got my june and july ones, too. pretty booked all the time. seven days a week. >> his schedule booked, his lawn care business booming. and his new customers in the suburbs of columbus, ohio, well, they're streaming in from a novel source. an online platform called next door. >> before i got the app next door, i passed out flyers and just went door to door. after i got next door, got a lot more customers, making more money. >> andrew is part of the rapidly growing on-demand economy that attracts more than 20 million customers spending close to $60 billion a year. customers that aren't just in the big cities. in fact, most of them are in rural areas and suburbs like andrews while only a third are in uben areas like san francisco, where these days there's an app to order just about anything. this is a form eer "today" show producer living in the bay area. she's been tasked with hosting her wine club dinner on demand. how much of the dinner do you think we can outsource? >>