The answer would likely be millet and meat because all kinds of meat were expensive at this kind of time.
Self interest helps achieve society's economic goals because it encourages each economic agent to look for maximum benefits at the minimum cost possible
In economics, self-interest is the idea that the best economic benefit for all can usually be accomplished when individuals act in their own self-interest.
Self-interest refers to actions that elicit personal benefit. Adam Smith, the father of modern economics, explains that individuals usually benefit most from acting in their own interests. According to his theory, the Invisible Hand creates goods and services that benefit both producers and consumers when dozens or even thousands act in their own self-interest.
Economies in which goods and services can be freely exchanged are characterized by self-interest and competition. As a result of these forces, good and services supply and demand as well as their value are influenced.
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Answer:Examples of valuable nonmetallic minerals extracted by mining are sand, gravel, phosphate
Explanation:
Nonmetallic minerals refers to those chemical elements that cannot be used to make any other products after they have been melted. Examples of these minerals are clay, limestone,marble , sand and gravel. They are called non metallic because they can not conduct electricity , can not conduct thermal power, they lack luster,rigor and malleability.
The non metallic metals are mostly used to make cements , lime and glass.
They can also be used in sanitary ,tableware and decorative products.
Several steps are followed in making certain products from these minerals such as grinding,cutting,mixing,shaping and heating.
