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Brand operations
A shop and a marketplace can both promise the last unit. Set a shippable count, hold units back for the gap between updates, and cap or ring-fence a thin seller-fulfilled channel. These are operating rules for any tool you use to sync. They do not describe Shopify's inventory updates. The Amazon.com and eBay.com consequences below come from US pages.
Brand operations
A positive gross-margin percentage does not say whether a product can take paid acquisition. A margin of zero or below leaves no cash for ads, so there is no break-even ROAS to aim at. Where cash remains after the order's variable costs, that cash limits ad spend per order.
Brand operations
For a growing D2C brand, distribution management is a spreadsheet problem: fixed cost against marginal cost, and how long your cash sits in stock while you decide which model to run.