Finance - Long Runner

1. max duration (67-37=30 years)  
2. min duration (20-12=8 years)

Base strategy

1. remove mortgage
2. invest in best Sharpe obligations (i.e. EM15) - StrategySwitcher ( first, second )

Optimal strategy

1. invest in optimal portfolio

InvestmentStrategy( initialAmount, frequency, increment, expectedReturn )