| I | purchase |
|---|---|
| you | purchase |
| he/she/it | purchases |
| we | purchase |
| you | purchase |
| they | purchase |
| I | purchased |
|---|---|
| you | purchased |
| he/she/it | purchased |
| we | purchased |
| you | purchased |
| they | purchased |
| I | have | purchased |
|---|---|---|
| you | have | purchased |
| he/she/it | has | purchased |
| we | have | purchased |
| you | have | purchased |
| they | have | purchased |
| I | had | purchased |
|---|---|---|
| you | had | purchased |
| he/she/it | had | purchased |
| we | had | purchased |
| you | had | purchased |
| they | had | purchased |
单语范例（未经PONS编辑处理）
In other words inflation can exist even if consumers have insufficient purchasing power to buy back all of production.
en.wikipedia.org Expenditures for war are taxing away one-third of the average worker's income and have cut the purchasing power of the farmer by one-third.
en.wikipedia.org In the process wage earners transfer part of their purchasing power over produced output to firms.
en.wikipedia.org This leads to decreases in the purchasing power of the country's assets.
en.wikipedia.org The economic value of money as measured by its purchasing power is a subject of economic theory.
en.wikipedia.org