Need examples of topics dealing with 2 Economic Concepts....

Question

Meaning .. Like Gas prices .. deals with supply and demand along with goods and services.

Which two economic concepts?

Please explain your question.

I reposted Another post stating what exactly what i was looking for in details thanks for the help!!

Here are multiple economic concepts.
-Supply
-Demand
-Markets
-Monopoly
-Perfect Competition
-Opportunity Costs
-Marginal utility
-Price elasticity
-Profit Maximization
-Pareto Optimal
-Laissez Faire
-Microeconomics
-Macroeconomics
-IS-LM models
-Consumption
-Supply Side economics
-Say's law
-Scarcity
-Gross National Product
-Productivity