The market is crashing right now
3 questions
When does a decline turn into a loss?
When you sell. Until then it's just a number that can change again.
Why is getting out during a decline especially costly?
Because many of the strongest recovery days come in the middle of the crisis or shortly after. If you're out, you miss them.
What's the one thing you should check at this moment?
Whether you'll need the invested money within the next three years. If not, today's price changes nothing about your plan.