10 years ago I drove a chevette. Lived on an apartment $300 per month apartment and had an annual income >$10,000.
Today my net worth is in the 8 digit range. Hard work and sticking to things can definitely make a difference. Not that what I did can be reproduced, there's a lot of good fortunate involved too.
What people like Poet Philosopher state ignores the obvious: He states symptoms of being poor as opposed to what causes them to be poor. Not being able to afford transportation or child care or medical bills (I bet he hasn't read that book but jsut regurgitated Shipler's interview examples such as the mother whose son with Asthma had to be taken to the hospital in an ambulance and couldn't afford the ambulance so her credit rating was wrecked) are all things AFTER being poor.
For instance, the mother who was too poor to afford the ambulance is a good example. a) She didn't set up with a payment plan? They do that in inner cities and I imagine elsewhere to.

She's that poor? Why does she have children in the first place? Was she ever married? Where's the father?
But those questions muddy up the sympathy picture.
It's easy to feel sorry for the 20 year old mother who has bad credit becaue of not being able to pay for an ambulance to take her poor child to emergency and therefore has to pay high interest rates to buy a new car. As mentioned in Shipler's book.
But then you look closer. And questions arise. How many people do you know have to go to the hospital from Asthma? It's almost always because they ran out of medication. How did she let that happen? Medicaid pays for Asthma medication. And she owns her own home (which is described as "drafty" -- so are many homes, but let's keep the sympathy going). And then maybe it turns out that she didn't finish high school because she got pregnant with the cidl when she was 16 and the father took off.
So what is the lesson learned? That we need to throw more money at these problems? OR maybe, JUST maybe, people shouldn't get pregnant unless they're married already and can afford children. Don't people don't where babies come from? I didn't have children until my mid twenties. Why? Because I couldn't afford children. I woudl have loved to have kids when I was younger. But I couldn't afford it.
And btw, the company that owns this website, the company I founded by myself had zero investment. I didn't borrow a cent in its founding. I just worked my ass off. Rags to riches isn't a dream. But it does require a basic handle on decent decision making.