"rising purchases" is correct and usable in written English.
You can use it to refer to a situation where people are buying more items, typically over a certain period of time. For example, "The rising purchases of electric vehicles suggests that people are becoming more aware of their environmental impact."
At one point this year, the United States surpassed China as Brazil's top export market, because of rising purchases of Brazilian oil and manufactured goods.
Mr. Vestberg told financial analysts that long-term demand for new network equipment was expected to remain strong, driven by rising purchases of smartphones.
So China's rising purchases of Treasuries do not represent the confident bet on America's future that they might seem to be on the surface.
This is a reflection of the rising purchasing power of Turkish buyers who now often compete with Middle East collectors for those pieces.
Increases in labour productivity may have driven the bulk of Indonesia's economic growth in the past 20 years (GDP is expected to rise by 6% this year), but low inflation rates, strong investment and rising purchasing power have helped maintain it.
Developers are turning to the 12 provincial cities in Russia with populations over one million, islands of prosperity with population inflows from rural migration and rising purchasing power, ripe for malls.
Interestingly, the perception of rising prosperity by the population at large will likely be higher than before, with rising purchasing power, despite somewhat lower GDP growth rates.
The firm has struggled for more than a year with rising purchasing costs, a strong Swedish crown and an increase in wages in Asia and transport spending.
The new growth pattern entails lowering the GDP growth rates to levels that are more balanced and sustainable, based on rising purchasing power of its population and less dependent on huge trade deficits elsewhere in the global economy.
Investors, expecting prices and incomes to rise, purchase residential and commercial properties, and they take chances on new business ventures.
The rising consumer purchases of PC's, cellphones, digital cameras and electronics gear all contributed to the strong performance.
