With payrolls now in the rearview mirror and nothing too outlandish revealed in the general goldilocks data, traders have resumed contemplating the one question that is on everyone's mind: how much higher (and at what pace) will rates rise before stocks are slammed?

To be sure, the recent spike in US yields - driven by a combination of very strong US growth data, sturdy equity gains, rising oil prices and improving global growth expectations - and the dollar can extend in the near-term, but as UBS points out, only as long as risk tolerates this (another key aspect is the recent speed of yields increase, which "might become problematic"): naturally, once rates rise high enough there will be a capital reallocation out of stocks and into bonds. The question, of course, is what is"high enough".

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Alternatively, US yields could rise further, if global growth firms up and ex-US yields rise independently - and also if the neutral rate (r-star) is seen as rising in tandem with yields – but in that case, the dollar rally would come to an end. Which is why, to UBS long term, US yields are likely to peak in the 12 months ahead "and the higher we go from here the closer we get to that peak – at least levels-wise".

But the biggest question whether US yields keep rising will depend on whether risky assets tolerate the spike. Earlier this year, UBS looked at the uptick in US yields and subsequent equities sell-offs of at least 5%. What the Swiss bank found is that the more gradual the rise, the higher the threshold to generate equity pain, and inversely the faster the move higher - and the latest episode has seen a 40bps move higher in just over a month - the more acute the equity reaction. Curiously, the duration and magnitude of the current yield sell-off is now virtually identical to the January 2018 episode that culminated with a 10% drop in the S&P.

That analysis, charted below, suggests we are now within a zone when yields can trigger a risk sell-off.

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So what happens next? While the answer for equities remains "fluid", the UBS credit team agrees with the recent pieces we published from Nomura's Charlie McElligott and suggests that US yields are reasonably priced for three reasons:

a) the long-end was anchored by fair expectations of neutral rates (even under a scenario where r* is revised higher);

b) the front end included an "uncertainty premium" which would likely decline over time leading to a flatter curve and

c) the market had priced little downside risk to growth (hence we continue to like receiving 1y rates).

Meanwhile, term premia have increased substantially – they could increase further but only if term premia in global rates pick up from here (a weaker dollar would be required for that). The recent bear steepening, extensively discussed by McElligott yesterday, in the 2s10s curve reflects this, supporting UBS' view that the front-end is fairly priced.

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Meanwhile, amid bearish signals for the 10Y Treasury (see below) and recent short-term data and oil strength imply that the market overshoots the "fair range" midpoint (between 2.9 and 3% in the UBS forecasts) in the weeks ahead, resulting in further pain for stocks, especially if the move higher is as rapid as it has been so far. 

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