# Monthly 60/40 Equilibrium
Source: https://www.yieldcurve.pro/blog/60-40-equilibrium-007  
Published: 2024-06-14  
Tags: 60/40, Bonds, ETFs, SPY, Stocks, TLT, noindex

_What do current market movements in stocks and bonds have to say about 60/40 fund weights?_

# What do current market movements in stocks and bonds have to say about 60/40 fund weights?

<br />

This is the June 2024 installment of a
<a href="/blog/60-40-equilibrium-001">series</a>
of posts we make to track how the weights of a synthetic 60/40 stock/bond
portfolio evolve intra-month.

Each month we coduct a simple experiment:  track the cumulative intra-month
return of two stock/bond indices (say SPY and TLT).  Next, combine that data to
estimate a one standard deviation envelope of weights as a function of the days
in the month.  Then measure where the current weights sit within the envelope.
This provides a measure of how much a typical 60/40 fund needs to move in order
to restore equilibrium.

Figure 1 depicts the envelopes and current weights for SPY and TLT.

<br />

<img src="/admin/blog/image/79/blog_60_40_equilibrium_007.png">
#### **Figure 1**: Stock/Bond Weights For June 2024

<br />

On an absolute basis, bonds have out performed stocks by a little over 100 basis
points.  Let's take a look at the stock-bond weightings month-to-date on a
relative 60-40 basis.

Stocks are about 50 basis points below average at this point in the month based
on historical data.  Based on symmetry this means that bonds are about 50 basis
points above average.  Assuming these positions are maintained until the end of
the month, this means that 60/40 funds will be net buyers of stocks and sellers
of bonds in order to restore equilibrium.

See you next month.

Cheers -- YCP