The Art of the Lie

In Chapter 12, Larry Harris introduces us to the Bluffers. If the Informed Traders are the data scientists, the Bluffers are the illusionists. They don’t have any real information; they just want you to think they do.

The Two Tools of the Bluffer

Bluffers use two main techniques to separate fools from their money:

1. Rumormongering: Spreading fake news. Today, this happens on Reddit, Twitter, and Discord. Back in the day, it was whispers in coffee shops. The goal is to get people to buy (so the bluffer can sell) or sell (so the bluffer can buy).
2. Price Manipulation (“Painting the Tape”): The bluffer makes a series of real (or fake “wash”) trades to move the price. They want momentum traders to see the price moving and think, “Someone must know something!”

Anatomy of a Bluff

Harris gives a great example of a long-side bluff:

• The Setup: Bill quietly buys 200,000 shares of a boring stock at $5.
• The Hype: He posts on message boards under 10 different names, arguing with himself to make it look like there’s a massive debate about this “undervalued gem.”
• The Trigger: A tiny piece of meaningless news comes out. Bill immediately buys 50,000 shares aggressively, pushing the price to $10.
• The Exit: Momentum traders see the $5 spike and the “news” and pile in. Bill sells his 250,000 shares to them at $11 and $12.
• The Crash: Once Bill stops buying and pumping, the price crashes back to $5. Bill is $1 million richer; the momentum traders are broke.

The Hunter Becomes the Prey

Bluffing is risky because of Value Traders. If a value trader (like “Valerie” in the book) knows the stock is only worth $5, she will happily sell short everything the bluffer is trying to pump.

If Valerie has more capital than Bill, she can “call his bluff.” She keeps selling until Bill runs out of money to keep the price up. Bill ends up owning a mountain of stock that he has to dump at a massive loss.

Why This Matters for Liquidity Providers

Dealers and market makers are the primary victims of bluffers. They use “the rule of supply and demand” to set their prices. If they see a lot of buying, they raise their prices.

Bluffers exploit this. They buy in big chunks to trick the dealer into raising the price, then sell in tiny pieces that don’t move the price as much. To survive, dealers have to be incredibly disciplined about how they adjust their prices.

Is it Legal?

Market manipulation is illegal in most countries, but it’s notoriously hard to prosecute. A bluffer can always just say, “I really liked the stock at $10, but I changed my mind at $12. That’s not a crime, it’s just trading.” Unless they are caught in a wash trade or a clear lie, they usually get away with it.

Next time, we move into Part IV: Liquidity Suppliers. We’ll meet the Dealers— the people who make it possible for you to trade whenever you want.

Next Post: Dealers: The Market Makers