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With a net worth of $17.2 billion, Fidelity Investments’s Abigail Johnson is by far the wealthiest person in Massachusetts, and number 23 on Forbes’s list of the 400 richest Americans. That’s a lot of mutual fund fees.

Johnson, who now runs Fidelity Financial Services, is the likely successor to her father, Edward Johnson III. At 83, “Ned” remains the Boston company’s chief executive, scraping by on a mere $9.3 billion.

For most people, even imagining that kind of money is difficult. To make it easier, here are some ways to help you comprehend a $17.2 billion portfolio:

(Essdras M Suarez/Globe staff)

Real estate

17 John Hancock towers (at $1 billion apiece).

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(AP/Mark J. Terrill)

Sports teams

All 30 NBA franchises (Forbes values them collectively at $15.3 billion).

(Roger Davies for Architectural Digest)

New homes

850 mansions equivalent to Tom Brady and Gisele Bundchen’s new $20 million California home.

(AP Photo/ Peter Dejong, File)

Energy projects

About 7 Cape Wind projects (it’s expected to cost about $2.5 billion).

(AP Photo/Susan Walsh, File)

Tax havens

The collective gross domestic product of tax havens Andorra ($4 billion), Liechtenstein ($5.1 billion) and Monaco ($6 billion), with $1 billion to spare.

(The Boston Globe)

Countries

Bosnia and Herzegovina, Botswana, Anguilla (pictured), Democratic Republic of the Congo, and Equatorial Guinea each have a GDP roughly equal to $17 billion.

(AP Photo/Pat Sullivan, File)

Aircraft

81 Boeing 787-8 planes at $211.8 million apiece.

(Dominic Chavez/Globe staff/file 2004)

MBTA

Run the MBTA at its current $1.9 billion budget for 8 years.

(ERIC MILLER/REUTERS)

Politics

Roughly 25 presidential campaigns (at 2012 levels).

(Marcio Jose Sanchez/AP)

iPhones

42.5 million new iPhones (64GB iPhone 5S).