People have different types of worries about material goods, depending on their economic level. ＿＿（36）＿＿ , most Americans desire a great number of material things: houses, furniture, computers, televisions, etc. They constantly want to acquire more things. The phrase " ＿＿（37）＿＿ " means that Americans seek to have as many material goods as their neighbors. Often, they feel dissatisfied if they don't have the latest models of products. On the other hand, people with ＿＿（38）＿＿ to spare may never think about buying the latest model of a car. They worry about ＿＿（39）＿＿ they can fulfill their basic needs. ＿＿（40）＿＿ food, water, and other basics is what they worry about the most. After they satisfy their basic needs, they may desire other material goods. Therefore, people of different economic levels have their own types of worries.