Why might variable expenses change a great deal at different times of year?

Heating and cooling costs might vary considerably.

question 1:

senate and house of representatives

i would try to answer the second question but i’m not 100% positive but i hope i

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .