a word that is defined by your question is a Commodity. Something that is literally meant to be bought and sold, like a stock. Also there is the com modification of ideas or things that weren't originally meant to be bought and sold, like sex.
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jewels
securities.
Factor Market
Equity is bought and sold in the stock market while debt is bought and sold in the bond market.
Commodity future contracts are transferable (can be bought and sold), to realize a profit or loss, but the obligation in the contract remains valid.