Fattony -- that's a useless static model of what actually happens in many urban areas
as posted elsewhere I use my family as an example:
- Grandfather arrives in US from Central Europe -- lives in Somerville and East Cambridge working mostly as a common laborer
- His son -- my father and my father's brother live in the same area just prior to WWII working at the Squires Meat Packing Plant -- mostly a lot of manual labor
- My father starts working at the Hingham Shipyard building Destroyer Escorts -- still living in Cambridge / Somerville and commuting
- My father joins the SeaBees -- and builds Communications Complexes on a couple of islands to enable the B-29's like the Enola Gay to bomb Japan
- After the War using the GI Bill my father attends BU while living as a commuting student in a house owned by his sister and her husband in East Cambridge -- he gets his BS and MS
- His sister never goes to college but works in a shoe factory in Boston when she wasn't managing the other 5 apartments in the house
- His brother never attends college but continues to work at Squires until it shuts down
- meanwhile he goes to war in Itally and returns with an Italian Bride and her mother
- They settle in working-class Medford and raise 4 girls and 1 boy
- All attend college
- my father moves to Hartford where working as a teacher of various topics he marries a literally "Coal-miner's Daughter] from Western PA
- attends night classes and gets a Master's in Education
- They build a house in a suburb of Hartford and have 3 kids [me first then 2 brothers]
- All of us attend MIT and graduate with SB's
- All of us continue on in various graduate schools and get science Ph.D's
- After we leave the house in CT -- my mother returns to school and gets her Master's in Education
- Meanwhile one of my father's brother's kids [my cousin] goes to college and ends up working for Northeastern as an IT professional
- she ends up part inheriting and part buying the multifamily house in East Cambridge once owned by my Aunt and my Aunt's husband
- The very same house once used for studying by my father circa 1948
- My cousin spends some of her salary fixing the old place up [gentrifying it?].
- Most of the people who occupy the house now have incomes higher than those who would have occupied it when my Aunt lived in it and managed the house while also working in the shoe factory in Boston.
- or who lived in it when I spent my summers living in the house while attending MIT and occasionally doing the handyman job -- fixing sinks and light fixtures, etc.
- Note the house was then subject to onerous rent-control so expenditures had to be kept to a minimum
While we aren't the 2 generations of the Curie's with 5 Nobel Prizes amongst four of them -- 5 people across two generations just removed from being [near penniless] immigrants to acquire 3 Masters and 3 Ph.D's -- that's why we came here
The above may not be typical -- but it does represent the kind of generational change making the concept of "Gentrification" a very misunderstood and misused term in the context of the American Experience