Answer: Decrease, decrease
Explanation: Substitute goods are those goods that are used in place of each other. When the price of a substitute good falls, it becomes more attractive to the consumers. Here, wood planks and wood beams are substitutes to each other. So, when price of wood plank falls, demand for wood beams will decrease, shifting the demand curve to the left. As a result, of this the equilibrium price of wood beams and the quantity of wood beams will also decrease.
The terms best refer to anything that can be bought or sold
goods and services
This is further explained below.
<h3>What
terms best refer to anything that can be bought or sold?</h3>
Generally, The output of an economic system consists of things like goods and services.
While services consist of activities that are carried out for the advantage of the receivers, goods are physical products that are sold to clients. Products such as autos, home appliances, and apparel are all examples of goods.
In conclusion, The terms best refer to anything that can be bought or sold
goods and sevices
Read more about goods and services
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It depends on the state. I think the youngest is 13 years old. But you have to work with high supervision.
Solution :
a). Bundles 
= U ( _____ , 2), lie on the same indifference curve. Suppose missing numbers is x.
So, 
(40 x 5) + (2 x 5) = 50x + (2 x 2)
210 - 4 = 5x
So Alexander has 
apples and 
bananas. The indifference curve though also include bundle.
Therefore, (41.2, 2)
b). 
= 0.4
So Alexander has apples and bananas with this bundle. Alexander would like to give up 
unit apples for a banana.
