The document discusses strategies for expanding ecommerce assortments through dropship and marketplace models. It provides a step-by-step decision process for determining which model is best for different brands, categories, and products. Key factors include brand requirements, existing wholesale relationships, catalog coverage, and profitability analyses. The document also compares the profit structures of different models using mattresses as an example and notes how marketplace commissions can be more profitable than negotiated margins for long tail products. It promotes analyzing each category individually to maximize profits.