Yes, so let me give you the general direction and Kathleen can comment more specifically on the numbers, if any. Look, I think first of all if we are - we continue to see enormous growth opportunities in our franchise in our business. We started [indiscernible] three years ago looking very heavily, and we found many, many more opportunities that we even expected and have been funding them and growing in them as you see, you know, evidenced in the top line growth. So, we want to continue to do that. With respect to the outlook for this market, we expect 2019 to be with respect to the AUM or at least the passive management part of the AUM. Remember, AUM also has futures and options in there, but what is expected from the passive management part of the AUM, we expect the 2019 to be a flattish kind of year; put maybe be a slight amount of cash inflows going into ETFs and therefore - and the reason is because bear in mind that the developed markets outside of the U.S. and the emerging markets have already beaming highly depressed levels for a lot of 2018. Can they go lower? Sure, they can were lower, but we have estimated that at this point that, you know, they may not, you know, they may not correct much more than that. We do expect significant volatility in the U.S. market, but not a bear market, so we think that there will be a lot of volatility up and down, but not a sustained bear market. So that's what is embedded in our thoughts processes into conclusion of a flat or so, you know, market level with an increasing amount of inflows that they give you a little bit of a positive impact on AUM. Therefore, based on that, our projection and the guidance we are giving you on expenses is around those assumptions and since we don't assume that there will be either a U.S. bear market or a global bear market further than, you know, over the years outside of the U.S., we do not anticipate changing any of the expense numbers as a reaction to volatility in the markets. Now, if, throughout the year, we see a change of those assumptions that is impacting our recession and a bear market is coming, we will wait a bit before we see total evidence of that and we will adjust our expenses. But for now, you should assume that that we are not, you know, that if there is up and down volatility per quarter, we will not be adjusting our expenses.