Suppose you think negative interest rates are ludicrous that you want to profit from them. Suppose you aren't really concerned with timing and so you are going to "buy and hold" this trade. Suppose you are a retail trader and you don't necessarily have a huge amount of capital or you want to "invest" in this trade over time (i.e., dollar cost average). What is the best way to short negative yielding bonds or rates so that you get paid while you wait for the inevitable day of reckoning? And what is a good way of doing this if you want to add only limited amount of capital at a time?