Jack bends and straightens his arm during arm wrestling. Which type of muscle does Jack use in the process?

Skeletal muscle

Explanation:

Skeletal muscle refers to the muscles that are attached to our bones.  These muscles were attached by a collection of collagen fibers which most commonly known tendons. We can move the vast majority of these muscles voluntarily

The act of bending and straightening the elbow like Jack did is being done by using the combination of biceps and triceps muscle that are attached to the skeletal structure of your arm.

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.