Compound interest occurs when the interest that accrues to an amount of money in turn accrues interest itself. It's the deceivingly simple force that causes wealth to rapidly snowball. This is why it's the concept that is at the core of all finance.
How much do you actually spend in retirement?
You’ll Never Guess Who’s Saving the Most For Retirement
An interesting tidbit from Time Money below. On one hand, great to see that household investable assets grew so robustly. On the other hand, the reason for the growth in retirement assets for the over 65 crowd tells me that overall, people are still smarting from the 2008-2009 crash and have delayed retirement because of it...