The carbon tax will be reflected in prices so you should just continue to make decisions on prices as always. The comparable goods that require more carbon to produce will cost more, so your supplier will need to charge more for them. So if you differentiate based on price, you will buy the cheaper (and also less carbon intensive) item.
Of course, since the comparable good will be much cheaper if produced in a jurisdiction without a carbon tax, it will be cheapest. So what I am doing is to continue to buy goods from the other side of the world.
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