New vendors don't fail because they're lazy. They fail because a market day is a slow, noisy teacher — you only get one attempt a week, and it's hard to tell which decision caused which result. These five mistakes account for most of the early losses.
1. Pricing Too Low
The most common and most expensive mistake. Underpricing feels generous and moves product fast, but it fails to cover spoilage and your time, trains shoppers to undervalue your goods, and leaves money on the table every single week.
2. Bringing Too Much Inventory
Optimism kills margins. Over-ordering perishable stock for an unproven market means you carry home — and eat the cost of — everything that didn't sell. Start conservative and scale up only once you know the market's real demand.
3. Selling the Wrong Products
Showing up with a product the market already has in abundance means fighting for scraps of attention. The fix is research: find the gap and fill it, rather than adding to a crowded category.
4. Ignoring Competitors
Your neighbors set the reference price in every shopper's mind. Vendors who never look at the booth across the aisle end up mispriced in both directions — too high to compete, or too low to profit.
5. A Weak Display
A flat, cluttered, or sparse booth gives shoppers no reason to stop. Height, color, abundance, and clear signage turn foot traffic into customers. Presentation is part of the product.
The Meta-Lesson
Notice that four of the five mistakes are really the same skill in disguise: understanding demand and pricing against it. That's exactly what a simulator drills. Make the mistakes where they're free, and your real market days start paying from week one.