You get bonus productivity over time, just by making stuff!
This mod finds all recipes (including those added by other mods) that allow productivity and have only one positive product. Those recipes are categorized by the single output they produce and hidden technologies are added for each of them. Each technology added has a threshold for the product that when reached adds a 10% boost to its recipes' productivity.
You'll start to feel the positive effects in the mid game, but won't achieve the highest productivity boosts until you craft many hundreds of millions of products.
This mod was designed as an attempt to thwart "perfect ratios" in a way that doesn't strictly penalize the player.