Final answer:
Ignoring a margin call gives the broker the authority to sell securities in your account, potentially at a loss, and can result in restricted trading privileges or account closure.
Step-by-step explanation:
If you ignore a margin call, your broker has the right to sell securities in your account without your consent. This is usually done to bring your account back up to the required maintenance margin and to protect the broker's financial interests. Ignoring a margin call can lead to significant financial losses, as the broker may sell your securities at an inopportune time or at a lower price than you might expect. Additionally, your broker may restrict your trading privileges or close your account if you repeatedly fail to meet margin calls.