Archer stock has nosedived 37% from recent highs -- should you buy the dip?Archer Aviation (ACHR 3.24%) is on the cusp of something potentially disruptive: Electric air taxi services, a concept that once seemed much more grounded in science fiction than reality. Electric air taxis will (in theory) fly paying passengers above gridlocked traffic, which will cut travel time significantly enough to warrant paying a premium for a flight.But here's the thing (or several things, rather): As of writing, the electri ...