Think of it this way. Merchants from the big city travel to the new city. They use the capital available from their rich trading company to exploit the resources available in the new city. Hence, the trade value of the product reflects the trading power of the big city.
If your hoola hoop factory in Dinkiesburg had to lease a cargo ship, send their own workers to the port to load it and unload it in the other country, hire multilingual salesmen to hawk them in the destination that would be like "no rehoming." You sell them to a distributor, and you ship them by some dedicated shipping company. That is like rehoming the hoola hoop freight unit.
But the game mechanics intentionally limit each city to three commodities (with rare exceptions designed into the mix). Rehoming is obviously a feature which they intended to disallow for trade units but never patched to prevent the cheat.
If your hoola hoop factory in Dinkiesburg had to lease a cargo ship, send their own workers to the port to load it and unload it in the other country, hire multilingual salesmen to hawk them in the destination that would be like "no rehoming." You sell them to a distributor, and you ship them by some dedicated shipping company. That is like rehoming the hoola hoop freight unit.
But the game mechanics intentionally limit each city to three commodities (with rare exceptions designed into the mix). Rehoming is obviously a feature which they intended to disallow for trade units but never patched to prevent the cheat.
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