Why Most Students Stall Out on the Mark Rush Micro Study Guide
I picked up the Microeconomics Study Guide Mark Rush a semester ago after watching three separate lectures on consumer theory go completely over my head. The videos are clear enough in isolation, but the problem sets treat you like you already know the material. You don't. The guide fills that gap, mostly. It's not perfect. I've used it through two semesters now and I'm going to tell you exactly where it works, where it breaks, and how to actually use it without wasting a weekend. The guide walks through the standard intermediate micro syllabus: utility maximization, production and cost theory, market structures from perfect competition to oligopoly, general equilibrium, and welfare economics. Each chapter pairs a condensed conceptual summary with worked examples that mirror the problem formats used in Rush's exams. The examples are the useful part. The summaries are decent but skip derivations that show up on tests. Here's something the guide doesn't make obvious: the worked examples are intentionally slightly simplified compared to actual exam problems. Rush likes to add a constraint or two that isn't present in the walkthrough. When I was preparing for my midterm, I noticed the guide's monopoly pricing examples all assumed constant marginal cost. The actual exam problem had a linear cost function. I spent twenty extra minutes deriving the second-order condition by hand instead of trusting the shortcut. That became my standard approach going forward—treat every worked example as a template, not a finished product.
One practical note: the guide uses Lagrangian optimization throughout. If you haven't done multivariable calculus recently, spend an afternoon reviewing constrained optimization before you start Chapter 2. Trying to learn Lagrange multipliers while also learning indifference curves simultaneously is how people drop intermediate micro.
How to Work Through It in Practice
Read the relevant chapter first. Then do the examples without looking at the solutions. The guide puts the answers in the back or in a separate section, and the temptation to peek early is real. I tried it once with the budget constraint problem and ended up memorizing the answer instead of learning the method. That cost me a hard problem on the final that had the same structure but different numbers. After you attempt each example on your own, check the solution. Where it diverges from yours, figure out whether the difference is a calculation error or a conceptual gap. Most of the time it's a setup issue, not arithmetic. Write down the correct setup. Don't just copy it. The act of writing it changes how your brain stores it. I also found that the guide's section on revealed preference was where I ran into the most trouble. The axioms are straightforward—weak axiom, strong axiom—but applying them to multi-commodity scenarios is messier than the guide makes it look. I encountered a practice problem involving four goods where the WARP test gave an ambiguous result because the price vector changed in a non-proportional way. The guide's explanation stopped at three goods. I had to work through the general case on paper using matrix notation, which isn't covered in the text. If you hit that same wall, just expand the logic yourself. The pattern holds; the math just gets longer.
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Where the Guide Falls Short
The section on game theory is the weakest part. Nash equilibrium in pure strategies is fine. Mixed strategies, subgame perfection, and Bayesian games get treated in about twelve pages across two chapters. That's not enough for a course that spends three weeks on these topics. You'll need supplementary notes or the textbook readings to cover the material adequately. The guide works as a quick refresher but not as a primary source for game theory. Another limitation: there are very few problems involving discrete choice or non-convex preferences. These show up occasionally on exams and in applied micro. The guide assumes smooth, convex everywhere. If your professor emphasizes corner solutions or kinked budget constraints, practice finding those separately. The guide mentions them in passing but doesn't give you enough repetition to handle variations comfortably. There's also no coverage of asymmetric information beyond basic adverse selection. Moral hazard, signaling, and screening models are treated in maybe five pages combined. If your course includes those topics, expect to supplement heavily or fall behind during review season.
Download and Access
The guide circulates primarily through academic file-sharing channels and student groups associated with the course. It's not published commercially, so there's no official storefront. Search terms like "Mark Rush microeconomics study guide PDF" will surface the relevant threads and repositories. Make sure the version you're using matches your course edition. Rush has updated the problem sets between semesters, and an older version might have problems that no longer appear on exams, or worse, problems with solutions that were corrected in later revisions. I'd recommend checking the date stamp on any file you download. A version from two years ago is probably close enough for conceptual review but risky if you're doing targeted exam prep. The problem numbers and sometimes the numerical values shift between editions.
A Few Things I Wish I'd Known Earlier
The duality between utility maximization and expenditure minimization is tested more often than students expect. The guide covers it, but only in one compact chapter. I underweighted it until the midterm hit and both questions relied on the expenditure function. Go back to that chapter twice. Once when you first encounter it and again two weeks later when the concept has had time to settle. Also, the section on producer theory moves quickly from cost minimization to profit maximization, but it skips the transition from short-run to long-run cost curves in any meaningful detail. The graph is there. The algebra isn't. Draw the derivation yourself. U-shaped average cost curves aren't magic—they come from the intersection of the short-run and long-run envelope. Understanding that envelope property saves you when a professor asks you to explain why the long-run average cost curve touches each short-run curve at exactly one point instead of crossing through it. The guide is a solid resource for intermediate micro. It's not comprehensive. It's not polished in every section. But used correctly—actively, with your own work in the margins and a willingness to fill in its gaps—it will get you through the course faster than watching lectures alone or flipping through the textbook blind.
