When Liquidity Holds, But Depth Gets Thinner

As of March 30, the better description of market liquidity is not “tight” and not “ample.” Markets are still trading in an orderly way, but the cushion underneath those trades has thinned. Reuters reported that volatility tied to the Iran war has widened bid-ask spreads in U.S. Treasuries and European bond markets, pushed dealers toward smaller trade sizes, and raised trading costs, even as markets continue to function. Reuters also noted that repo markets have remained stable, which matters because it suggests the funding system itself is not under immediate strain. In other words, liquidity is available, but it is less forgiving than it was earlier in the quarter. (Reuters)

That distinction matters. A market can keep operating without signaling that conditions are easy. Late March has looked more like a market with selective depth: enough liquidity to clear trades, not enough depth to absorb shocks comfortably.

This is typically a functioning-but-thinner liquidity environment. It sits between two cleaner regimes. It is not an easy-liquidity backdrop where markets absorb size with little friction, and it is not a true liquidity squeeze where funding breaks down and price action becomes disorderly.

Historically, this kind of environment shows up after a shock has already forced repricing. The first phase is volatility. The second phase is adaptation. Market makers stay active, but more cautiously. Investors can still transact, but execution matters more. The system works, just with less room for error.

Experienced investors usually start with market depth, not headlines. They watch whether price moves are being amplified by thinner order books rather than by a genuinely new macro message.

They also watch the difference between market liquidity and funding liquidity. That distinction is important right now. Reuters’ recent reporting has pointed to weaker trading conditions in Treasuries and other markets, but not to a breakdown in repo funding. That combination tells you the system is stressed at the execution layer more than at the funding layer. (Reuters)

A third signal is trade size. When dealers are still making markets but are less willing to warehouse risk, it often means liquidity has become more selective rather than unavailable.

A common misread is assuming that because markets are open and functioning, liquidity must be healthy. Functioning is not the same as abundant. Markets can clear trades while still offering less depth and less tolerance for sudden repositioning.

Another misread is assuming that wider spreads automatically mean crisis. They do not. Wider spreads can simply mean dealers want more compensation for taking risk in a volatile backdrop.

There is also a tendency to describe liquidity as either “good” or “bad.” In practice, liquidity is often conditional. Late March looks more conditional than broken.

Separate availability from ease.

Liquidity right now appears available enough to keep markets operating, but not easy enough to ignore execution risk. That is the useful frame. The question is not whether liquidity exists. It does. The question is how much friction stands between the market and the next move.

The mental model here is elasticity. A liquid market bends without much effect. A thinner market still bends, but it moves further before it settles.

Late March does not look like a full liquidity squeeze. It looks like a market that can still function, but with less depth, wider spreads, and less willingness to absorb risk smoothly. (Reuters)

That kind of environment tends to matter most when a fresh catalyst arrives. Until then, the useful read is simple: liquidity is present, but it is no longer generous.

Talk soon,
The Playbook Daily