On Monday I wrote about the crowded short trade that boosted energy futures 40-50% from the lows of only a few weeks ago. A related crowded trade was the short-inflation trade, and it also was related to carry.

TIPS, as many readers will know, accumulate principal value based on realized inflation; the real coupon rate is then paid on this changing principal amount. As a rough shorthand, TIPS thus earn something like the real interest rate plus the realized inflation (which goes mainly to principal, but slowly affects the coupon over time). So, if the price level is declining, then although you will be receiving positive coupons your principal amount will be eroding (TIPS at maturity will always pay at least par, but can have a principal amount less than par on which coupons are calculated). And vice versa, of course – when the price level is increasing, so does your principal value and you still receive your positive coupons.

This means that, neglecting the price change of TIPS, the earnings that look like interest – those paid as interest, and those paid as accumulation of principal, which an owner receives when he/she sells the bond or it matures – will be lower when inflation is lower and higher when inflation is higher. It acts a little bit like a floating-rate security, which is one reason that many people believe (incorrectly) that FRNs hedge inflation almost as well as TIPS. They don’t, but that’s something I’ve addressed previously and it’s not my point today.

My point is that TIPS investors behave as if this carry is a hot potato. When carry is increasing, everyone wants to own TIPS; when carry is decreasing no one wants to own TIPS. The chart below (Source: BLS) shows the seasonal adjustment factor used by the Bureau of Labor Statistics to adjust the CPI. The figure implies that prices tend to rise into the summer and then decline into year-end, compared to the average trend of the year, so we should expect higher increases in nonseasonally-adjusted CPI in the summer and lower increases or even outright decreases late in the year.