A recent customer, a man, fed in a dollar bill and a quarter and punched the code for peanut M&M's, only to watch in horror as his selection spiralled to the end of its coil and dangled precariously from the dewlap of its packaging.
Without healthier people to spread the risk, their premiums skyrocketed, a phenomenon known in the trade as the "adverse selection death spiral".
Selection of spiral parameters, rotation rate and pressure gradient along the channel controls the flow rate ratio of the phases and the relative thickness of the phase layers.
In its extreme form this results in unsustainable price and cost increases, and the potential termination of a plan, known as an "adverse selection death spiral" [ 53].
But the catastrophic-failure scenario envisioned by the ACA's critics, in which low enrollment composed of disproportionately sick people leads to premium hikes and an adverse-selection "death spiral", now seems unlikely (though it isn't entirely out of the question, as our health-care correspondent writes).
The pool of the insured gets sicker and sicker, premiums rise higher and higher, this in turn makes healthy people even more reluctant to buy insurance (the famous adverse-selection death spiral), and ultimately you end up with middle-class people unable to afford insurance at all.
As, on the one hand, the cost of insurance keeps increasing and, on the other hand, new cheap genetic tests inform millions of relatively young people that their near-term health risks are quite low, more and more people will opt out of the system, sending it into an adverse-selection death spiral.
A bit like my own diverse selection, currently comprising: spiral bound, plastic covered with a snap fastener from Dynamic Earth; a small black pocket-sized pad with an elastic band to keep it closed; an A4 Pukka Pad; a leather-bound notebook bought in a tiny shop in Siena.
The process of grain selection in the spiral selector was investigated by both a ProCAST simulation based on a cellular automaton finite element (CAFE) model and experimental confirmation.
The crystal were formed after the remained columnar grains were eliminated through preferred growth and coupling of spiral structure in Spiral grain selection.
