About the book
Choice, by economist Robert P. Murphy is a simplified and condensed version of the book Human Action by the economist Ludwig von Mises. Human Action is one of the most important books on economics ever written, but it is over 950 pages long and not easy to understand. This book covers all the topics covered by Mises, though in a different order as deemed appropriate by Murphy to make it beginner friendly.
Why study economics?
"Public policy in democratic societies will always reflect the economic understanding of the general
public. If the general public believes that imports hurt the domestic economy, a policy of free trade has no hope of being realized. If the general public does not understand the dangers of discretionary monetary policy, discretionary monetary policy will persist. If members of the general public do not understand that the well-being of the poor and the middle class improves as entrepreneurs and businesses are more free to innovate and compete, public policy will be a nest of obstacles to innovation and barriers to competition." - economist Donald J. Boudreaux (in the Foreword to the book)
"Whether we like it or not, it is a fact that economics cannot remain an esoteric branch of knowledge accessible only to small groups of scholars and specialists. Economics deals with society's fundamental problems; it concerns everyone and belongs to all. [Economics] is the main and proper study of every citizen." - Ludwig von Mises
How is Economics Different from Natural Sciences?
There are different schools of thought on the proper economic methodology. According to Mises, economics is more similar to geometry than (say) physics of biology: Start with irrefutable axioms and logically deduce each step.
"the laws or principles of economics cannot be established through laboratory experiment or empirical data, in the same way that a fact of the natural sciences can be demonstrated. Economic principles are a priori knowledge, which must be deduced theoretically and then deployed by the economist to interpret historical observations."
"In practice, episodes in economic history are complex phenomena, involving multiple factors. As there are no truly controlled experiments in economics—especially in macroeconomics—it is impossible to isolate and test rival theories. This is why, for example, Austrians and Keynesians still
argue about the Great Depression or more recently about the success or failure of the so-called Obama stimulus package of early 2009. In economics, rival theories cannot be judged the way they can be in the natural sciences. As Mises puts it, “The economist can never refute the economic cranks and quacks in the way in which the doctor refutes the medicine man and charlatan."
(Note: In line with Ayn Rand's Objectivist Epistemology, I don't believe that the starting point of economics are "a priori axioms", rather that they are inductive generalizations. This is a complicated topic beyond the scope of this review. Nonetheless, given these starting points, the rest of the conclusions follow deductively just as in a geometric proof.)
The "Axiom" of Human Action and its Implications
Mises considers economics to be the most commonly known subset of the broader field that he calls Praxeology, the science of Human Action.
Action refers to purposeful behavior, not include all human behavior (such as reflexive behavior.)
The fact of action has some implications.
1. If There’s Action, There Must Be an Actor
2. Purposeful Behavior Implies an Underlying Purpose (Preferences)
3. Preferences Are a Subjective Ranking, Not an Objective Measurement
4. An Acting Individual Thinks He or She Can Influence the Future
Purposeful behavior isn’t necessarily rational behavior in the sense of being correct (e.g. doing a rain dance for rain is purposeful behavior, it’s simply guided by false beliefs.). However, in a free-market, purposeful behavior tends towards rational behavior over time, because “a market based on private property has built-in mechanisms that tend to weed out important decisions based on improper calculations or false expectations about the future.”
Further Economic Concepts and Principles Flowing from Action
Human Action: Using reason to adopt means to achieve a desired purpose.
Consumer goods: Economic goods that are fitted to satisfy human wants directly (first-order goods.)
Producer goods: Economic goods that satisfy human wants only indirectly by helping to create consumer goods (higher-order goods.)
Natural resources (“land”): Producer goods that are the direct gifts of nature. Observe that matter that does not have any use doesn’t count as natural resource.
E.g. Goal (first-order good): A coconut to alleviate hunger.
Tool (second-order good): A branch to knock down the coconut.
Tool for tool (third-order good): A rock to break off the branch.
Notice how you need to think backwards, starting from the first-order good and what it requires.
The value isn’t in the object itself, it’s in your mind (a relationship between your preferences and the object’s properties.) The same branch could be a tool or a back-scratcher.
(Side-note: Objectivism calls value Objective. Austrian economics calls it Subjective. Regardless of the term, it’s important to note that it’s not in the mind alone but rather in the relationship between the valuer’s preferences and the object’s properties.)
Every action is an attempt to substitute a more satisfactory state of affairs for a less satisfactory one. Undertaking any action requires giving up alternative courses of action.
Opportunity cost: The value of the next-best alternative that you must give up to attain the end you’re aiming for.
The Diamond-Water Paradox: Why are diamonds worth more than water when water is essential for life? Because we don’t choose between ALL water and ALL diamonds. We choose based on the value of each additional unit.
For example, suppose Fred has 3 water bottles. He uses them as follows.
Bottle 1: To drink right away (highest value)
Bottle 2: To save for the night (medium value)
Bottle 3: To give to his dog (lower value)
If Fred loses one bottle, he gives up the LEAST important use for it, not the most important one.
Law of Diminishing Marginal Utility: As you get more units of a good, you use each new unit to satisfy a less urgent goal.
Take the example of dish-washing at a cafeteria. Beyond a certain point, hiring more people would simply lead to them getting in each other’s way. Peak efficiency (dishes per worker) will maximize at certain number of workers. But peak efficiency isn’t always the goal either. For a busy shift, maximizing total output may be more important even if that comes at a somewhat lower output per worker.
Whether alone on a desert island or as a manager in a cafeteria, we use scarce resources to achieve our most important goals first.
Above are some of the points that I found useful to note for myself, but I encourage reading the book in full to see how Mises builds on this starting point.