Um, no... "hoping" is not part of any arbitrage. This is called a "punt" with borrowed money. It's an arbitrage if you can borrow at lower rates as a muni issuer and invest in top-quality bonds that yield more.
It's called sound fiscal management if you spend less than you take in. So, Mr. Mayor, how bout some belt tightening?
I say - KILL THE DAMN PENSION!!
Believe me .. the only pension should be a 401K - much safer - and a whole lot cheaper for the city.
Sanders keeps talking about issuing bonds when the city can't even get fiscal audits for 2003-2005. How's he plan to get authorization to sell bonds with no valid financial data?
Why not reduce the pensions?