Internet retail has structurally shifted consumer spending online, but the economics vary enormously by model. Pure marketplace operators earn fees without holding inventory, producing high margins and asset-light scalability. Direct retail models carry inventory risk, require massive logistics infrastructure and operate on thin margins at scale. Advertising has become an increasingly important revenue stream for the largest platforms, as access to high-intent purchasing data commands premium ad rates. The competitive moat in internet retail comes from logistics speed, product selection breadth and consumer trust — incumbents with established fulfillment networks are extremely difficult to displace. Profitability is often sacrificed early for market share, making traditional valuation multiples misleading during growth phases. Customer acquisition costs, return rates and logistics cost per order are the operational metrics that separate durable business models from unprofitable scale. For investors, the category rewards patience and rewards scale economics over time.