Well, there are a few things to consider. Firstly, spreads are affected by the fundamental information embedded in econ releases. Secondly, spreads mechanically have some long-term directionality, i.e. they move with the mkt in a particular way. Finally, there are short-term effects that have to do with the lag between the swap and cash bond mkts that can have short-term impact on spreads. It's difficult to be more specific, because the actual nature of these relationships constantly shifts.Quote from NAVEEVIa:
I have three questions
1. Lets say NY session has started , do you see much variation in these swap spreads( more than 1 bps) e.g. after any major data release like NFP last friday USTs advanced initially as data was bad but did anything happen on swap spread front, anything significant?
I assume you mean 3m fwd yields. Well, this is a case of chicken and egg. The two are very much inter-related, because, fundamentally, there's a relatively strong no-arbitrage relationship between the LIBOR instruments, like Eurodollars, and cash USTs. Unfortunately, the core assumption of the no-arb argument is unlimited liquidity and balance sheet. During the normal times, both are not unlimited, but ample, which means that things move mostly in lockstep and swapspreads are relatively stable. Then they are affected mostly by longer-term, structural factors, such as the fiscal situation and issuance patterns. However, when liquidity disappears like last year, all sort of hell can break loose and there could be times when USTs rally while Eurodollars sell off.2. Does the change in cash UST yield curve & implied change in 3 month forward rates anyway influence eurodollar futures?
I don't know what 'people' do, to be honest. I think some people definitely look at technicals. I personally don't, but tastes differ.3. Whats do people who trade STIR future spreads look at for decision making? IMHO technicals have not much role here.
Naveen