Where it that written?Spec Trade have to be over saturated goods. As local merchants are already fulfilling those deals.
If the traveller can sell it to that system, the local would have already done so.
The question was how could anyone make money on Common Consumables. Rather than look for reasons why it couldn't work, I chose to look for reasons why it could.
You also assume there are local merchants who have the resources to conduct trade at the volumes required. This is at the wholesale level, most will be retailers trading in smaller quantities for less overall investment, greater effort, but probably greater percentages. There may well be established traders selling 14 cubic metres of fruit at a time, and if the referee determines there are then you will be trading with them and their Broker skill will be counting against your effect, the rules also allow for someone familiar with local markets to gain a bonus to their trade roll. You will buy dearer and sell cheaper meaning you will be relying more and more on having to wait for the right price and either having no stock until the price drops or having to store goods until the sale price is good enough. You will incur storage fees, and might run out of money in the mean time. Of course a local broker might just chose to make his 10% by buying on behalf of other traders and leveraging their cash reserves instead of his own.
There is no consideration of saturation at any level in the game or by that argument all those IN/NI cash cows on the mains would already be saturated and you wouldn't be able to sell there either. There is seldom a reason that someone else can't get there first, so the referee is supposed to make it an adventure. Trade rivals create adventure opportunity and that can happen at a planetary as well.
The limit to trade opportunity is transport. Before the railways the markets were pretty local and oversaturation was very possible. Once you can ship across country the market for non-perishables grew. On a low tech agri world, you might be the only one with an imported grav carrier or launch. You can reach places the locals cannot and faster. If you have a fusion plant and they are relying on internal combustion you can operate more cheaply as your costs will reduce. You get this benefit as you invested in your infrastructure and to do so you will have had to make less investment in stock. Different traders have different business models.
Even if everyone has the same level of transport not everyone is covering the same trade routes. On a high population world the market may exceed the ability to produce enough goods and everyone is clamouring for the latest thing only for the boom market to crash again months or weeks later (loombands and fidget spinners anyone?). Common Consumer Goods are not a single product and there can be room for everyone in the market.
If you wish for plot reasons to have oversaturation then that is fair enough, but I think by stating it as a default you are adding in a limitation that doesn't exist and doesn't need to.
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