Final answer:
The importance of houses and cars overtime cannot be determined without specific study data. However, the median age of first marriage has increased for both men and women, a trend influenced by various social factors. For standard of living, an equal percent increase in costs and salary suggests that it has remained the same.
Step-by-step explanation:
The question relates to a study about how the importance of houses and cars has changed over time. Unfortunately, the question does not provide enough context for an accurate answer regarding the trend in importance placed on houses and cars. To provide an accurate response, information from the specific study in question would be required. However, research generally indicates that the value people place on material possessions like houses and cars can change due to various factors such as economic conditions, cultural shifts, and personal priorities.
As for median age at first marriage, the data suggest that the median age of first marriage has increased for both men and women. Increasing educational and career opportunities, changing social norms, and a shift in personal goals have contributed to this trend globally. This is a significant social change that has been observed in demographic studies over recent years.
In the context of standard of living, if the cost of a fixed basket of goods and your salary both increased by 25%, your personal standard of living has ostensibly remained the same. This is because the proportion of your income that you would need to spend on these goods has not changed; you have more money, but the things you need to buy are also more expensive in exact proportion.