Cost of safety

According to Michael Hartnett, a strategist at Merrill Lynch; if someone today is investing in cash, it would take:

• 360 years to double his/her money in US Dollar ($) deposits
• 150 years, if it was in Pound Sterling (£) deposits
• 440 years, it it was in Japanese Yen (¥) deposits.

I think that it is becoming obvious to many that cash is a horrible investment; especially in currencies of heavily indebted countries.