A portfolio is a group of assets held by an investor .
A system in which two or more parties exchange goods, services, and information is called a market. Ideally, the market is where more than one party is involved in buying and selling.
The two parties involved in a transaction are called the seller and the buyer.
Sellers sell goods and services to buyers for money. A market needs multiple buyers and sellers to be competitive.
Monopoly-A monopoly is a market with a single seller and many buyers. In this situation, the seller has no competition and monopoly and has complete control over the product or service.
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