When your main beef with the modern world is people's obsession with money, you're bound to get into issues of greed. And Pound does just that in Canto XLV. He never uses the word greed explicitly, but what he's mostly criticizing in this poem is the way that people's narrow-minded pursuit of money comes at the expense of any actual stuff getting made.
For example, someone from a bank might make a lot of money by playing the stock market or lending out money at a high interest rate. But at the end of the day, nothing is actually produced. A factory owner, on the other hand, makes money off of brushes, cars, or whatever that factory makes. For Pound, the real problem is the fact that greedy people are able to make money without actually producing anything for other people.
In Canto XLV, Pound claims that making money without producing anything yourself is just about the worst thing you can do.
In Canto XLV, greed is the main cause of conflict between human beings, even husbands and wives.
Now making money without producing anything for other people is one thing for Pound, but it's a completely other thing if moneylending and finance actually prevent people from producing something. But when you think about it, usury and finance can have this effect. Imagine that a gifted carpenter makes enough money so that he can spend the rest of his life making a living off the stock market. That guy will totally stop doing the thing he's good at to manage his money, and the world will lose one more amazing carpenter. According to Pound in Canto XLV, we're all made poorer when we starting making money without creating anything new.
In Canto XLV, Pound suggests that there is no form of art more important than the humble trades (i.e., weaving, carpentry, stonework, etc.).
In Canto XLV, Pound says that modern art is doomed because our obsession with money has made it impossible to care about beauty and skill in art.
Pound doesn't really bring up sex until the final few lines of Canto XLV. But these lines are some of the most powerful ones in the entire poem. For the most part, Pound is all about how usura and modern finance tends to take talented people away from their crafts. But toward the end of the poem, Pound gets more aggressive and says that usura is a total sin against nature that keeps anything new from ever being produced. And when he talks about "anything new," he also means human beings. In other words, he suggests that even something as simple as human sex and having children is ruined by people's obsession with money.
For Pound, a person's ability to carve a chair or paint a picture is the same as their ability to produce a child. For him, there's only production and non-production, and non-production is the wrong way to go.
In Canto XLV, Pound undermines the traditional connection between money and power by saying that men who make their money off of lending and speculation are basically impotent, incapable of adding anything valuable to the world.
Pound might not have been a straight-up Christian, but Canto XLV sounds like it could have come out of the harshest books of the Bible (Leviticus, maybe?). In this poem, Pound specifically uses the Latin form of usury—usura—in order to convey a sense of how usury is a deeply spiritual sin. And in case we missed the point, he later says directly that usura is a "sin against nature" (14).
For Pound, nature has a constant cycle of production and reproduction that human beings participate in by creating objects (like chairs and buildings) and having kids. But when people start making money off of other money, nothing ends up getting produced. And for Pound, this stops the natural processes that keep human life going. And yeah, that's not a good thing.
In Canto XLV, Pound basically scapegoats one tiny portion of human behavior in order to explain all of his beefs with the modern world.
In Canto XLV, Pound exposes usura as something that is actually anti-capitalist, since it prevents people from ever making any real products to sell.