I'm in the early stages of bootstrapping a marketplace similar to those that exist for hotels (e.g. Booking.com, PriceLine, etc). The supply-side is primarily small businesses ("merchants"). The demand-side is consumers. The initial target market niche is small (~$600 million/yr in the US), but the product can serve a much larger market niche and I will do so when resources permit.
Today, this market niche is fragmented with high search costs for consumers. My marketplace will make it much easier for consumers to find and buy the products this this niche. Once off the ground, the marketplace will be a key source of customers for the merchants.
Consumers like the product, but the merchants are difficult to get on board. I find that the prevailing view is that the status quo is 'good enough'; merchants are conservative, and very few are early adopters.
Things I'm doing to address this:
1) Price for growth -- pricing based on a small flat fee that the merchant pays per transaction to align with value delivered, with first X transactions free (obviously I would prefer to charge a % of revenue, but that's a very, very hard sell with these particular merchants).
2) Provide the merchants with tools that help them run their business (i.e. give them reasons independent of the marketplace to use the app)
3) In-person visits to merchants. These are valuable for many reasons, and are only partially a sales call. These visits will always be something I do, but it doesn't scale enough to create a marketplace.
What strategies and tactics do you suggest to get merchants into the marketplace, to build up the supply-side?