Many people are also excessively high in calcium. This creates a chemical imbalance which definitely effects the behavior of a person's neural network. Magnesium supplies conducting ions in neurotransmitters, which are critical in the brain chemistry. These are important for conducting signals from one neuron to the next. Calcium, on the other hand, acts as an insulator to prevent conduction of electricity.
Excessive calcium is often due to low magnesium, although there are other causes.
It is extremely important for Johnny to have his trace minerals in balance. So maybe Johnny can't trade because he doesn't understand the care and feeding of the neural network between his ears. Every trader who sits down to trade has the world's most fantastic super computer between his ears. Those 10 billion neurons are capable of extremely powerful pattern recognition, decision making, and trade execution. But Johnny needs to give that brain a chance.