Ow lumber costs and lower prices on new homes is an example of:
a market economy
an interrelated market
a planned market
a fixed market

an interrelated market

Explanation:

An interrelated market shows the relationships between supply and demand of goods that might be substitutes, complements, or derivates.  

When the supply or demand of a good affects the supply or demand if another good there is a correlation between these goods. In this case there is a derived demand because the production of lumber has a strong impact in the production of homes.  

Another example maybe the change on prices of steel and the production of cars.    

- "a new era of american politics began with jackson's election in 1828, but it also completed a grand social experiment begun by the american revolution. nevertheless, jacksonian democracy represented a provocative blending of the best and worst qualities of american society."

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the urdan working class