What is supply and demand? A. An economic idea that the value of a product is determined by
how much of it exists in relation to how much people want to buy
it
B. An advertising principle that the number of people who buy a
product is directly proportional to how many public figures
endorse it
C. An economic principle supporting the idea that wealth should be
shared evenly
D. An advertising scheme in which advertisers give products away so
that other customers will want to buy them

The answer is

A. An economic idea that the value of a product is determined by how much of it exists in relation to how much people want to buy.

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A

Explanation:

If more people want a product and there is not much of that product, then that product is in high demand. If a product is in high demand it is worth more therefore the price will go up.

a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.