W. Robert Berkley
President and Chief Executive Officer at W. R. Berkley
Rich, thanks very much. That was great. So, I'm just going to offer a couple of other quick observations on the quarter and how we see things unfolding from here, and then again, we'll move on to the Q&A.
Rich touched on the top line, obviously, building momentum again, as promised. This is a reminder to some number of quarters ago, we agreed to disagree with a couple of partners as to what we thought was an adequate rate. They did not think that we needed that much rate and again we decided to part ways that had a meaningful impact to the negative on our top line. That pig is making its way through the python to the extent that it's of interest, that was in the auto line. So we wish them well and we'll see how that unfolds.
Speaking of different products, obviously the marketplace for the past 12, 18, 24 months or so has been very focused on property and with good reason. I would suggest to you, as we've commented in past quarters, auto liability is one that people need to continue to pay close attention to. I think as far as product lines, when it comes to social inflation, auto liability has the biggest bullseye on its chest. And by extension, that clearly spills over to excess and as well as umbrella.
That having been said, just in general, social inflation continues to burn and we do not see that abating anytime soon. Quick comment on workers comp, I know we've touched on this in the past. We continue to be of the view that one needs to be very mindful of medical cost trend. We went through a period of time where it was pretty benign. We think that is shifting very quickly. We've touched on it in the past. We think it's going to become more and more into focus for a broader audience over the coming quarters.
In addition to that, the benefit that comp was getting both as it relates to COVID and frequency and then on the heels of COVID a tight labor market and wage inflation, I think those benefits have run their course and clearly wage inflation is slowing.
I mentioned a moment ago the topic of social inflation. We are very focused on it. You can see it in our rate increases. Ex-comp coming in at 8.5%. We have every intention of continuing to stay on top of it. We think the market is accepting our rate increases, and you can see that in part demonstrated by our renewal retention ratio continues to be at approximately a steady 80%.
Another number that I find useful, perhaps others do as well, is the paid loss ratio. This is a number that we flagged for you all in the past, again coming in at a very healthy 47.9% for the quarter, which obviously, given where we are booking the business, would leave one to believe that the strength of our IBNR speaks for itself and would encourage people to look at our IBNR relative to case and IBNR relative to total reserves to the extent you're interested in the topic.
As far as the investment portfolio goes, again, Rich went into some detail on this. I touched on it earlier. But without a doubt, it's not just about the 4.5% that we're getting on the book yield. I think the bigger story is the new money rate today of give or take 6%. You compound that with the strength of the cash flow that the business is experiencing. I think it's again setting a table for a very encouraging future. The duration we did bump out from Q3 to Q4, I think it's more likely than not over time you're going to continue to see that push out. But the fact is, having kept it short the way we have has given us greater flexibility to take advantage of the higher rates in a more immediate or over a shorter period of time.
Finally, and perhaps a little bit on the forward-looking and picking up on the comments about the investment portfolio, nobody knows with certainty what tomorrow will bring, and there certainly is the potential for volatility to be around the corner. That having been said, you can see the business's ability to weather a choppy time as far as cat activity. You can see the rate increases that we are getting, and you can see how, quite frankly, I should say, we can see where the book yield is going.
So that all having been said, I think it's very clear where the -- how the business is positioned for the coming quarters and the coming years, and the earnings power of the business is likely to be accelerating from here.
Lisa, I'm going pause there, and why don't we go ahead and open it up for Q&A.