The concentration-time curves for two sets of reactions,A/B and C/D,are: 
Which of the reactions are first order?
Definitions:
Aggregate Demand Curve
A graphical representation of the total demand for goods and services in an economy at various price levels, holding all else constant.
Expansionary Gap
A situation where the actual output in an economy exceeds the potential output, leading to inflationary pressure.
Expansionary Gap
A situation in macroeconomics where a country's actual gross domestic product exceeds its potential GDP, leading to inflation.
Fiscal Policy
Refers to the use of government spending and tax policies to influence economic conditions, including demand, employment, and inflation.
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