Trade promotion refers to sales promotion tools used to persuade resellers to carry a brand, give it shelf space, promote it in advertising, and push it to consumers. Shelf space is so scarce these days that manufacturers often have to offer price-offs, allowances, buy-back guarantees, or free goods to retailers and wholesalers to get products on the shelf and, once there, to keep them on it.
Trade promotion is the sales promotion geared to marketing intermediaries rather than to final consumers.