Correct Answer: B. devalues her currency

Correct Answer: A. consumers

Explanation

The invisible hand is a natural force that self regulates the market economy. An example of invisible hand is an individual making a decision to buy noodles and egg, that person decision will make the economic society as a whole better off. This individual(s) are consumers that indirectly influences market economy as regards, what to produce, when to produce, how to produce and for whom to produce

Correct Answer: D) all of the above

Explanation

This Economics question is asking about the elasticity of demand for a commodity. Elasticity of demand is a measure of how sensitive the quantity demanded of a good or service is to changes in its price, income, or availability of substitutes.

The question is asking which of the options makes the demand curve for a commodity more elastic. The correct option is Option D: all of the above. This means that if there are more substitutes available for the commodity, if a greater proportion of income is spent on the commodity, or if the period of time considered is longer, the demand curve for the commodity will be more elastic.

When there are more substitutes available for a commodity, consumers have more options to choose from and if the price of one commodity increases, they can easily switch to a substitute. This makes the demand curve for the commodity more elastic.

When a greater proportion of income is spent on a commodity, consumers are more likely to be sensitive to changes in the price of the commodity. If the price of the commodity increases, consumers may cut back on their purchases or switch to a cheaper substitute. This makes the demand curve for the commodity more elastic.

When the period of time considered is longer, consumers have more time to adjust their consumption patterns in response to changes in the price of the commodity or the availability of substitutes. This makes the demand curve for the commodity more elastic.

In summary, the correct answer is Option D: all of the above because all three factors - availability of substitutes, proportion of income spent on the commodity, and length of time considered - can make the demand curve for a commodity more elastic.

Correct Answer: A. Sudan

Correct Answer: A. An avenue for expressing national prestige

Correct Answer: A. more will be supplied as price rises

Correct Answer: C. y > 200

Correct Answer: B. air

Explanation

An economic good is a good or service that has a benefit (utility) to society. Also, economic goods have a degree of scarcity and therefore an opportunity cost. This is in contrast to a free good (like air, sea, water) where there is no opportunity cost.

Air is a free good and not an economic good

Correct Answer: A. the ratio of change in an endogenous variable to the change spending

Explanation

A multiplier is a factor of proportionality that measures how much an endogenous variable changes in response to a change in some exogenous variable such as investment, consumption, government expediture etc.

Correct Answer: B. there is adequate knowledge of existing prices