Margin Call
A broker's demand to add cash or close positions when a margin account's value falls too low.
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Commissions
The explicit cost of trading: what commissions are, the forms they take, how the spread and currency fees act as hidden commissions, why 'commission-free' isn't free, and how trading costs quietly erode returns.

401(k)
The US workplace retirement plan: what a 401(k) is, how pre-tax (and Roth) contributions work, why an employer match is free money to claim first, how tax-deferred growth compounds, contribution limits, vesting, and the rules around accessing the money.
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