This index halves and doubles and collapses and booms all the time. Just look at its chart over the years.
It's simply due to what it is: a measurement of the demand for shipping a set of raw materials versus the amount/tonnes of vessels for them, there is a variety of elements that together draw it, so fluctuations can be due to any / combination of them, and, also important, the index is a leading indicator, it says something about the future, and what it is now, is an outcome of a past.
For who does it matter: for those that put their money in those vessels.
For others, well, it all just depends. Why does an index / price change: two sets of elements, classified under supply and demand. A new series ships production is a supply boomer and thus price collapser (as an example), for the future.
The index is now low, meaning that supply of ships increased and/or(important) demand for shipping dropped.
To actually judge any global economic outlook based on this, it requires figures of amounts / tonnes new ships. Figures of tonnes demand of these and those products. Those 'major alerters' here do not show or care. They blindly look at the index itself, claim a future based on the index itself, with complete ignorance of the underlying what's going on.
For ex, a stable / unchanging amount ships / tonnes capacity, and a dropping baltic dry index would mean a bad economical outlook.
But a stable / unchanging demand for shipping, and a droppng baltic dry index, would mean a good economical outlook, because shipping will be cheaper in the future, and thus positive for those that have to pay it.
http://www.imsf.info/documents/IMSF2014/Developments in International Shipbuilding - Jenny.pdf
Look at the actual shipbuilding completions. 2009-2010 shows a double top.
Look at
https://upload.wikimedia.org/wikipedia/commons/a/a6/BDI.png
The Baltic Dry Index shows a double top in 2008, to then collapse during the last months to a 198x bottom revisit.
Using the same thinking, one could in 2008 have claimed Major NonAlert, everything rosy, flowers bees and sunshine.
Yet, the crisis and the plunge back from the double rosy top occurred just some months later.
Now some claim Major Alert (not surprised to see Zerohedge in the results), in the future, at a low BDI.
So called bad economical outlook.
Well lol, their timing is like a half decade too late. Maybe that's because they need others to think that something wouldn't be "in the market" yet?