There’s a profound difference between assets that produce no income and those that produce net income.

To those of us nutty enough to pore over dozens of pages of data on wealth and income in the U.S., the Federal Reserve’s quarterly Z.1 reports and annual Survey of Consumer Finances (SCF) are treasure troves, as are I.R.S. tax and income reports.

Allow me to share a few observations on family wealth and income drawn from my review of these documents:

Changes in U.S. Family Finances from 2013 to 2016 (42 pages)

Financial Accounts of the United States (198 pages)

Corporate profits clock in at $2.135 trillion annually, around 11% of the nation’s GDP (gross domestic product). (Page 10 of Z.1) This has changed very little over the past few years; corporate profits totaled $2.140 trillion in 2014.

Most people who follow financial matters closely probably know corporate profits have been around $2 trillion annually for a while.

But how many know that proprietors’ income from small businesses ($1.375 trillion) and rental income of persons–i.e. not corporations–($740 billion) together equal corporate profits? ($2.115 trillion for small biz/rentals, $2.135 trillion for corporate profits.

How many financially savvy people know that proprietors’ income and private rental income rose by $189 billion since 2014, while corporate profits flatlined?

Clearly, the families that own the proprietorships and rentals pulling down $2.1 trillion in annual profits are doing a bit better than OK.

As the charts below reveal, most of this profitable business equity is owned by the top 10% of families. There are a few clues that suggest that family-owned business equity is distributed along a power-law curve, i.e. the majority of wealth and income is held by the top and the rest is distributed over the rest of the owners.

On Page 28 of the Survey of Consumer Finances (SCF), we find that the business equity owned by families in the bottom 50% of family incomes has a mean value of $208,000, up marginally from $204,000 in 2010, the business equity held by the top 10% of families rose from $2.265 million in 2010 to $3.3 million in 2016–a gain of over $1 million.