Imagine a ledger. A perfectly ordinary accounting ledger, columns of numbers, neat handwriting. Except what is being counted is human beings. Each prisoner assigned to a quarry or a factory earns the SS a daily fee — between 30 pfennigs and 5 Reichsmarks — recorded as a line item. The prisoner sees none of it. The prisoner is the product. That is the system we are examining today. In the last lecture we traced how the SS became a state within a state. Now we follow the money. On 29 April 1938, the SS founded Deutsche Erd- und Steinwerke GmbH — DEST. The purpose was direct: exploit prisoner labor to produce building materials for Nazi state projects. DEST placed its quarries and brickworks immediately adjacent to camps — Sachsenhausen, Mauthausen, Flossenbürg, Neuengamme, Gross-Rosen, Buchenwald, Natzweiler-Struthof. The geography was not coincidence. It was logistics. The camp was the labor supply. The quarry was the factory floor. And the granite operations around Mauthausen and Gusen became among the largest and most profitable SS industrial groups. How was all of this coordinated? Through the SS Main Economic and Administrative Office — the WVHA. In March 1942, the WVHA absorbed the Inspectorate of Concentration Camps directly. Camp administration and economic management became one function. The WVHA's W department managed major SS companies including DEST and Deutsche Ausrüstungswerke, and reportedly oversaw more than 500 SS businesses drawing systematically on camp labor. Think of it as a holding company — except the workers could not resign, could not negotiate, and could not leave. Now the phrase that historians use: Vernichtung durch Arbeit — annihilation through work. What did this mean in practice? Prisoners in quarries like Mauthausen worked under deliberately lethal conditions — starvation rations, brutal violence, impossible quotas — until they collapsed. The labor itself was the killing method. This is the counterintuitive point. The SS wanted economic output and it wanted to destroy people. These goals did not contradict each other. They reinforced each other. A prisoner worked to exhaustion was replaced by a new deportee. The deportation pipeline fed the labor pipeline. The SS did not keep this system to itself. It leased prisoners to private corporations — Heinkel, Junkers, Krupp, Messerschmitt, Siemens, and IG Farben. The most documented case is IG Farben's Buna synthetic rubber plant at Auschwitz-Monowitz. The SS supplied thousands of inmates. A labor camp of approximately 7,000 prisoners was attached directly to the complex. IG Farben paid the SS. The SS kept the fee. The prisoner received nothing and was worked toward death. For example, at Munich-Allach, BMW used prisoners to produce and repair aircraft engines under identical arrangements. How do we know this? The evidence is documentary. Nuremberg trial records — specifically the Pohl case — placed SS industries and DEST's quarry operations at the center of war-crimes prosecutions. WVHA correspondence, company archives, and camp mortality statistics all survive. Nuremberg records document prisoners welding air torpedoes at Natzweiler and assembling aircraft parts at Flossenbürg and Mauthausen. The accounting ledgers recording daily prisoner fees are part of that record. This is not inference. It is documented industrial history. James, here is the precise takeaway. The SS did not stumble into economic exploitation. It built a deliberate industrial empire — DEST, DAW, OSTI, and hundreds of subsidiaries — managed through the WVHA, leasing human beings to private firms and running its own lethal production sites. The phrase 'extermination through labor' was not metaphor. It was policy expressed in quarry mortality rates, deportation schedules, and accounting columns. The ledger we opened with is the evidence. And the evidence is unambiguous.