Net worth is a static metric. Standard of living is a dynamic one.
A person could maintain a good standard of living by using the ROI of a large net worth as gross income--or simply by dissipating the capital of a really large one. But people whose net worth is that large are a statistically insignificant portion of the population. Most Americans' net worth is less than six months' gross income and therefore has only a minor influence on their standard of living.
After all, our goal by definition is to accumulate sufficient net worth to retire by living off the sum of the income plus an actuarially sound conversion of the capital--plus our pathetic little pensions. The fact that so many of us are working beyond the traditional retirement age of 65 and even into our 70s indicates that we are failing to achieve that goal.
BTW: My degree is in accounting.
The absurd part is that accounting is portrayed as difficult enough to be worth getting a degree in. I think everything that most people need to know about it could be taught in a semester.
Net Worth is only static on the balance sheet. If a person owns some stock their Net Worth could be fluctuating from minute to minute. Their home could be appreciating while their car is depreciating. The economy is a mess because the vast majority of people don't know accounting. That statistically insignificant proportion of the population want other people working to make them richer.
I think standard of living is a meaningless concept invented by economists. It is meaningless because it is to vague to have any precision but it sounds meaningful to the ignorant. Those who want to manage others want the others kept ignorant. When do you hear economists advocating mandatory accounting?
psik