In the past five years, the average price of clothes purchased by all households in a certain place has increased by 50%, but the proportion of the average household consumption expenditure on clothes purchase has not changed. It also increased by 50% during the year. What assumptions are the above conclusions based on? ['The average cost of buying clothes for all households has not changed during these five years.', 'The average number of clothes purchased by all households has not changed in these five years.', 'Over the five years, the number of households in the area has increased by 50%.', 'Over the five years, the total expenditure of all households in the area on clothes has increased by 50%.']