Share your insights or perspective on the financial matter presented in the input.

Is it unreasonable to double your investment year over year?
Not at all impossible. What you need is Fundamental Analysis and Relationship with your investment. If you are just buying shares - not sure you can have those. I will provide examples from my personal experience:  My mother has barely high school education. When she saw house and land prices in Bulgaria, she thought it's impossibly cheap. We lived on rent in Israel, our horrible apartment was worth $1M and it was horrible. We could never imagine buying it because we were middle class at best. My mother insisted that we all sell whatever we have and buy land and houses in Bulgaria. One house, for example, went from $20k to EUR150k between 2001 and 2007. But we knew Bulgaria, we knew how to buy, we knew lawyers, we knew builders.  The company I currently work for. When I joined, share prices were around 240 (2006). They are now (2015) at 1500. I didn't buy because I was repaying mortgage (at 5%). I am very sorry I didn't. Everybody knew 240 is not a real share price for our company - an established (+30 years) software company with piles of cash. We were not a hot startup, outsiders didn't invest. Many developers and finance people WHO WORK IN THE COMPANY made a fortune. Again: relationship, knowledge!  I bought a house in the UK in 2012 - everyone knew house prices were about to go up. I was lucky I had a friend who was a surveyor, he told me: "buy now or lose money". I bought a little house for 200k, it is now worth 260k. Not double, but pretty good money!  My point is: take your investment personally. Don't just dump money into something. Once you are an insider, your risk will be almost mitigated and you could buy where you see an opportunity and sell when you feel you are near the maximal real worth of your investment. It's not hard to analyse, it's hard to make a commitment.