According to economists, people’s tendency to purchase a given commodity is inversely proportional to its price.
Conclusion (Obviously, then)
There are exceptions to the economists' general rule.
economists' rule: Tendency to purchase is inversely proportional to price.
Conclusion-translated: Sometimes people's tendency to purchase a given commodity is not inversely proportional to its price (i.e. the price rises and more want to buy it, or the price drops and fewer people want to buy it)
Evidence
Sure there's an example that fits the economists rule, where price and purchasing were inverted: the price of steel went down, and the amount purchasing went up.
But, there's a counterexample to the rule, where price and purchasing were aligned: the price of lace went down, and the purchasing of lace went down (if you can't rub it in the poor's face that they can't afford lace, then what's the point?)
Evaluate
The arguments on Main Conclusion and Role are intentionally more opaque. They don't want to make finding the conclusion an easy part of the process, because it's the main event on these questions. So any time we're doing Main Conclusion or Role, we're anticipating the conclusion probably won't be at the end with an obvious Therefore / Thus indicator word. But sometimes it will be last, usually on easier ranked problems like this Q4.
Instead, the Conclusion will usually be one of these two: - the first claim in the paragraph - a rebuttal
In this case the conclusion is at the end of the paragraph, and it does have some indicator words, although they're less obvious ones.
Obviously / evidently / clearly / apparently are frequently used on LSAT to show us an opinion, and of course when we're searching for the Main Conclusion we're searching for the opinion that the author supports.
Then / consequently / as a result are used to show the terminal end of a chain of thought, i.e. the conclusion of a train of thought.
This final sentence is the author's rebuttal, so if we're familiar with looking for Rebuttal Conclusions and First Sentence Conclusions on Main Conclusion and Role, we'll hopefully gravitate towards the rebuttal, since the first sentence contained an attribution to "economists".
The claim we're being asked about is the author's concession to the occasional validity of the economists point of view.
The four claims here go like this:
1. Attributed claim "according to economists, X"
2. Author's conceding some validity "here's an example about steel that matches X"
3. Author pivoting into premise "Nevertheless, here's a counterexample to X"
4. Author's rebuttal conclusion "Obviously, then, the economists are wrong"
Goal
They're asking us about #2, so we want something like,