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The equilibrium positionA measure of the relative concentrations of substances in an equilibrium, showing if there are more reactants or products at equilibrium. of a reversible reactionA chemical reaction which can go both ways. is a measure of the concentrationThe concentration of a solution tells us how much of a substance is dissolved in water. The higher the concentration, the more particles of the substance are present. of the reacting substances at equilibriumIn chemical reactions, a situation where the forward and backward reactions happen at the same rate, and the concentrations of the substances stay the same..
The “goods market” is a vague-sounding (and rather poorly named) term in economics that is nevertheless an important macroeconomic concept. Goods market equilibrium refers to the idea that, in an economy, there is equilibrium between how many goods consumers want to buy and how many goods producers want to supply.
This means that supply and demand are balanced. There is no excess demand, no supply surplus, and no problems: everyone can participate in the market transactions they want to. This is only possible if aggregate demand and aggregate supply are equal (AD = AS; we assume in this article that short and long-run aggregate supply are the same).
This also happens to be the point where desired national savings and desired national investment are in equilibrium at a certain interest rate. Understanding how these concepts are intertwined is important for intermediate macroeconomics students, so let’s dive in.
The goods market equilibrium is often defined in economics textbooks as the point where “desired national savings” equals “desired national investment”, sometimes referencing the savings-investment identity, since the identity describes how investments must equal savings. Some authors or textbooks might introduce these…