Production Possibilities Curve (PPC)
On the right is an example with two workers, each with linear PPC, and their aggregated PPC. You can drag the point of production for each.
Note for instance that if Zach (whose comparative advantage is in burritos) starts making tacos while Yolanda is not yet fully specialized (in tacos), their joint production will be below the combined PPC, indicating that this is an inefficient strategy.
Here, we've added a 3rd worker. Once again, drag the 3 points of production to trace out their joint PPC.