You are long USD if you believe USD will remain relatively stable while many other securities actually diminish in value for various reasons. Even if the invest

You are long USD if you believe USD will remain relatively stable while many other securities actually diminish in value for various reasons. Even if the investor is not ultimately correct, this qualifies as investing. Investing involves risk management, not just positive returns, and hedging a long position with a position in something like USD is not comparable to shorting.