If consumers increase their purchases of goods and services, then a likely outcome for our economy is

The answer is: Rising GDP

Here is how a nation count its yearly GDP:

Total Consumption + Total Investment + Government Spending  + (Exports - Import).

The act of purchasing goods and services are included to the total consumption of that nation. This is why when the amount of goods/services purchased increased, the economy will experience a rise in GDP.

answer; participant observation method;