Soft May sunlight sifts through broad sycamore foliage at 68 Wall Street. It gilds the edge of a small bronze plaque on the sidewalk. Most hurrying workers barely glance at it. This is where 18th-century traders gathered to speculate. A reckless financier’s gambit had thrown the young market into chaos. William Duer borrowed huge sums to corner two major bank stocks. Prices rocketed for weeks, then began to plummet when his cash ran out. The market’s sudden collapse wiped out fortunes across the city. Thousands faced total ruin, from merchants to junior clerks. State regulators moved quickly to curb unruly street trading. Twenty-four local brokers refused to abandon their livelihoods. They met in the tree’s cool shade to negotiate a simple pact. The terms set a fixed minimum commission for every deal. They promised preferential treatment for each other in every transaction. No fanfare marked the signing, only tight, nervous handshakes. The stakes they agreed on were invisible to onlookers that day. A fierce gale felled the old sycamore in an 1865 storm. The exchange moved into grand marble halls blocks away over time. It grew into the epic global financial hub we know now. Those two short sentences helped forge a system built on mutual trust.