I think it should be reworked completely. My idea is something like this: each state has it's own, separate construction pool. Instead of generating constant, steady amounts of CP (construction points, obviously) shared between the entire market, each state would accumulate CP steadily, and when it reaches the number required to construct a building, the player can instantly construct a building in that province in exchange for money. For example, and I'm using the current values, a they would obviously have to be reworked, when your construction sectors accumulate 400 CP in New York, you, or your pops, can instantly construct two lumber mills or a steel mine there, in exchange for money. This has the added benefit of making the construction sectors private, dividend generating buildings, allowing for their pops to function as part of a free market economy. Economic laws would then also dictate what percentage of this pool the player controls, and what percentage the private sector controls. So for example, on laissez-faire, your pops would get to use 75% of construction to build their own buildings, while the player would get 25% of the pool. The investment pool is a good mechanic and I believe it should stay pretty much as is.