Stock Buying - Power

If the stocks you already own drop in value, your equity decreases. Because your borrowing limit is tied to your equity, your buying power drops too.

is essentially the total amount of money you have available to purchase securities. Think of it as your "spending limit" at the brokerage mall. stock buying power

Brokers require you to keep a certain percentage of equity in your account (usually 25% or higher). If you dip below this, you’ll face a margin call , where your buying power hits zero (or goes negative), and you're forced to deposit cash or sell assets. If the stocks you already own drop in

Your buying power isn't a static number. It changes based on: Think of it as your "spending limit" at the brokerage mall

If you put all your money into one "risky" or volatile stock, a broker might reduce your leverage, effectively lowering your buying power to protect themselves from a total wipeout. The Bottom Line