Sure, I’d say 80% of households should have enough to put money aside. Anything they spend money on that isn’t absolutely necessary by definition is blowing it, because that’s money that could have been saved or invested.
I’m going to zero out inflation for now to look at everything in current dollars.
And I’ll point out that I was originally addressing your original comment that what keeps poor people poor is ignoring the fact that anyone can invest. By looking at the top 80%, we’re ignoring 1 out of 5 people and no longer discussing what “anyone” can do. Assuming you’re looking at the US, the 20th percentile pretax household income is about $25k with an average household size of 2.5, which is above the poverty line ($17k for family of 2, $21k for family of 3) so by ignoring the bottom quintile we’re technically no longer discussing what keeps poor people poor.
So what does it look like at the boundary?
Over the long term, you might expect something like 5% real growth in stock prices (7% nominal - 2% inflation). I’m not sure what you mean by “nest egg” exactly, but let’s say you want to invest enough to maintain your current income into retirement. If you wanted to do that by living solely off the interest of your investments, you’d need to have invested $500k by the time you retire.
I’ll point out that lack of inheritance is one of the things that keeps poor people poor before taking the more traditional approach of assuming you’ll just kill yourself when the money runs out. I’ll go into Numbers and choose the “retirement savings” template. I’ll start saving at 20, retire at 65 and throw myself off a bridge no later than my 100th birthday. I’ll continue my $25k income, assume a 5% return on my investments and 0% inflation. Apple tells me I need to save $214 per month.
At that income, income taxes probably aren’t much of a burden. I’ll ignore FICA taxes and things like earned income tax credits.
So what is and isn’t necessary? After your $214 a month, you’re down to $1870 to pay expenses for 2.5 people. Hard to find numbers that aren’t anecdotal, but I picked St. Louis as a reference because it’s a reasonably inexpensive city. Median rent is $869. Average electric, gas, water and garbage come to $115+$75+$70+$14=$274. (I can’t find 20th percentile numbers for rent or utilities). Transit passes are $78 a month, so assuming two working adults that’s $156. Food seems to come in around $300 for one person, but the basket of goods isn’t well defined— call it $500 for a household of 2.5.
We’re up to $1800 of that $1870.
Sure you might save a bit on rent and utilities below the median or average, but what else is necessary that isn’t yet accounted for? Depreciation of clothes and appliances? Medication? Education? Internet? Cell plan?
What about elder care? Later in life, $25k a year won’t cover all of the costs of living plus the ballooning medical costs and special care needs of old age. We’d need to account for that either by increasing the necessary savings or by assuming our household is helping cover the costs of their parents.
As a friend of mine once said: when you’re poor you need to be perfect because one mistake can put you right back where you started. Get caught once without your bus pass, and there goes that month’s retirement savings. An ambulance ride? That probably wipes out a year or more.
You can argue my numbers up or down a bit, but it becomes clear that trying to fit within a budget like that takes a lot of active management which itself takes the kind of time and education that the least privileged among us don’t always have.
And are stocks really the right savings vehicle when you’re that close to the edge? If you’d been invested in stocks in 2000 or 2008 and retired shortly before those crashes, it would have laid waste to your life savings. Long run estimates of 7% growth gloss over the shorter term volatility— you need to be able to weather those storms to reap the gains.
So, while I strongly agree with what I understood your broader point to be— that the cultural perception of investing as a rich man’s game discourages people of more modest means from benefiting from an important path toward wealth creation— I think it’s equally important for people with money to invest to not make the blanket assumption that if everyone was just more responsible with their money there would be less poverty. A lot of people truly don’t have have the cash, the training, or the access they need to the benefit from the markets.