[单项选择]

It seems now that a dollar is not the same as that

ten years ago. We can not use it to buy as many things as before. No one can deny that one dollar is worth 100 cents. The amount of money is fixed but the value has experienced great changes. Do our living conditions get decreased Many people are confused about this question.
All the goods are ruled by the axioms of supply and demand. We all know that workers earn more than before, as a result, they have more to pay for what they need or what they like. The great demand promotes the price to go up. At the same time, if there is a shortage, the price also goes up. According to the economists, the value of money depends on the cost of living. The cost of living is what we spend on the necessities. The food, housing and medical expenses have increased largely these years, so the value of money has decreased. For some people whose salary has not increased much, the expense of living becomes a headache. Don’t worry about that
A. Take notes of what we spend on expensive items.
B. Prepare every tool we can find to help make budget.
C. Buy a calculator to help us do calculating in the budget.
D. Find various software to do the budget.