Feedback gives somebody another point of view other than there own allowing them to improve themselves
Economists call this a change in demand as the curve is directly linked to the demand of the product. When the demand goes up or down the curve moves left or right accordingly.
Answer:
40 air conditioner and 60 fans yield a 1,900 dollar profit
Explanation:

We apply this constrain on excel solver tool.
Wiring Drilling Profit per unit Total Profit
AC 40 units 120 80 25 1000
Fan 60 units 120 60 15 <u> 900 </u>
240 140 1900 1,900
Answer:
C. shortage of skilled labor.
Explanation:
The invention of high-tech (computers, biotechnology, robots, drones, self driving vehicles and so an) is reducing the involvement of skill human labor which will continue incoming years. For example humans carryout the task of carrying-out calculation several years ago, but in recent years computers carry out such works and at a faster pace. Also routine human works such as arranging, bottling, pasting of labels can be carried-out by well programmed out and trained robots. These and many more will cause the shortage of labor(human) in coming years.