One of example that pops into my mind watching Elon Mush show, he said something along the lines "it is not difficult to get money there is plenty of money and investors who want to invest, I can just turn few phone and I will have investment of few hundred millions". Because hast that type of the network.
For me and probably most of the people I know, I do not know where to begin, most average income people networks are not investors type, so we do not have a clue, where to even find people who are willing to listen for a five minute pitch, without feeling that you are begging for money...
In that regard poor or middle class will never be the same as rich, it is amount of struggling to keep up the daily needs.
If rich person gets bankrupt, he can easily bounce back, with connections he has, he can turn few phone calls and again pop up on the ladder, issue with other people they are not even close to ladder, until you get to ladder, there is path through swamp, forest, dark cave, and dragon on two ...