Unit profit and cash availability are different questions. A product can be profitable on paper while the business lacks enough cash to place the next order.
The next order starts before the first one ends
Production and inbound shipping require time. Reordering only when inventory is nearly gone can create a stockout.
Revenue is not immediately reusable cash
Marketplace payout timing, advertising spend, refunds, and operating expenses affect how quickly sales become available for the supplier deposit.
Growth can increase the gap
Faster sales improve revenue but also bring the reorder date forward. A seller may need more working capital precisely when the product performs well.
Model multiple speeds
Test conservative, expected, and faster-sales scenarios. The output should show the reorder date, expected cash recovered by that date, and any remaining funding gap.