Interest rates are a big factor..however, let me suggest that another significant reason MLPs are kind of under pressure and treading water is that they have been too successful..and this I mean that right now there's too much natural gas available and far too much natural gas liquids available. Hey, you can't give ethane away..and propane pricing is in the tank...there is also a ton of crude available now but infrastructure is lagging. And a lot of refineries have to be modified to run light crude from shale fields instead of heavi,imported crudes. In three or four years supply/ demand should be in balance...more power plants burning natural gas, more propane being exported or converted into propylene, 16 odd crackers using ethane as a feed stock, and at least 3 liquid natural gas plants shipping to Japan,India etc..I fully expect MLPs to be significantly higher in unit price then and unit distributions to be soaring. Since PAA is one of the very best count on it to be a winner then,too.