Hey Andro - no problem! Let's see if we can sort this one out
To start with, we need to make sure we're clear on two things: (1) exactly what the conclusion is, if one is present; (2) the question type we're seeing. So we'll begin with the stimulus and any argumentation/reasoning there, and then discuss what we're asked to do!
The argument here is a bit convoluted—no surprise from question 21—but to sum it up: the Economist presents a belief in the last sentence, that total bank lending to companies is less than it was five years ago. This is based on a set of facts where banks can't charge large, financially strong companies interest rates that are as high as the ones the banks pay for that same money (the money they hope to lend), banks also won't lend to companies that are not financially strong, and finally banks' total lending to small and medium-sized companies is less than it was five years ago.
In fact, let's enumerate those three premise points to really highlight what this conclusion rests upon:
1. Banks can't charge large, financially strong companies interest rates that are as high as the ones the
banks pay for that same money
2. Banks won't lend to companies that are not financially strong
3. Banks' total lending to small and medium-sized companies is less than it was five years ago
Now re-examine the exact conclusion:
total bank lending to companies is less than it was five years ago. [emphasis mine]
When you consider that the conclusion is arguing about an amount—total lending—and compare that idea to the three premise points above, you should notice that only points 2 and 3 are also about lending volume! That is, in point 2 the banks don't lend to companies that are not financially strong, so that's zero lending at present (so certainly not more than five years ago). And in point 3 the banks are lending less to small and medium-sized companies than they were five years ago, so that's a lower amount now (a decrease, which aligns with the author's conclusion).
But what about point 1? All we're told there is that banks pay higher rates to borrow than they can charge to lend to large, financially strong companies...but we know nothing about lending
volume from this! And that's the potential flaw in this argument: just because banks can only lend to large companies at lower rates than the bank pays, or might even take a financial loss in the process, doesn't mean they won't lend, and it certainly doesn't tell us how much lending-volume change has resulted! So with that unknown aspect, the conclusion as given is not yet valid/knowable.
The question itself is Justify the Conclusion, where we want an answer choice that would prove that banks are lending less to companies now than five years ago. And to prove that belief, we MUST address the glaring uncertainty about lending volume to large, financially strong companies (lending at a lower rate than that originally paid). Specifically, it would be helpful if we could say that banks now lend less under those circumstances than they did five years ago, or that banks don't lend at all in cases where the rate they pay is higher than the rate they can charge.
And that's precisely what answer choice (A) tells us: banks don't lend at rates that are lower than the rates they pay to borrow.
If that's true, then banks aren't lending to large, financially strong companies. Further, from points 2 and 3 listed above, banks aren't lending to any companies that aren't financially strong, and are lending less to small and medium-sized companies. So that's now zero lending volume for point 1. Zero volume for point 2. And lower volume for point 3. Considering that covers all company types (small, medium, and large), then cumulatively current lending volume must be lower now than it was five years ago, and the author is proven correct!
It's a tricky question because it hinges on spotting the element that's still uncertain (lending volume based on interest rates for large, financially strong companies) and then resolving it, but answer choice (A) does that beautifully.
I hope that helps!
Jon