The core idea
Global bond markets are enormous and include sovereign, agency, corporate, securitized and other debt, but comparisons with equities depend on the dataset, date and definition used.
What is happening underneath
The more useful distinction is functional: bonds dominate debt financing and interest-rate transmission, while equities represent ownership claims.
How investors should read it
BondStats avoids presenting a timeless single size figure because outstanding amounts change continuously.
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.