The solitary aggressor
If you are the victim of an attacker that requires your car, your wallet, your bag, etc… do not try to resist, the attacker could become violent, and your life cost more than that!
When shopping, not show the money in public; prepare a modest amount before arriving at the case.
If you have a large amount of money on you, divide it in two different places and do not keep it attached to your identity papers, car our house keys.
If during your walking you carry a valuable object, you should keep it on the side of the walls, which offer less accessibility to robbers.