There are 165,000 yard sales each week in the US, attracting 690,000 bargain hunters. VarageSale has now brought these peer-to-peer marketplaces online, boasting the latest UX technology and local communities in 400 cities globally. Can it challenge the might of Craigslist and eBay?

Americans buy five times as many clothes as they did in 1980, with 10.5 million tons shipped off to landfills annually. While brands like Patagonia are making coats that last a lifetime, Twice is helping people monetise decluttering. But can second-hand shopping match the buzz of fast fashion?

We no longer crave the new. Half of online shoppers in the UK visit eBay each month and the site's fashion category attracts 4.5 million people. Luxury goods re-seller Vestiaire Collective has discovered that British women are leading the way for buying and selling pre-loved clothes online.

As taxes go up in Japan, consumers are developing a new taste for the old. As a result, the flea market is jumping. But not as per tradition; now the concept has shrunk to fit your pocket. The second-hand marketplace app Mercari is attracting smartphone shoppers, could it overtake eBay?