Sap transport proteins. Recent evidence indicates that mobile proteins and RNA are part of the plant's long-distance communication signaling system. Evidence also exists for the directed transport and sorting of macromolecules as they pass through plasmodesmata." A large number of insects of the order Hemiptera (the half-wings), feed directly on phloem sap, and make it the primary component of their diet. Phloem sap is "nutrient-rich compared with many other plant products and generally lacking in toxins and feeding deterrents, [yet] it is consumed as the dominant or sole diet by a very restricted range of animals". This apparent paradox is explained
Sugary drink tax third parties (MXC) and so want to consume at the unregulated market equilibrium to maximize their utility. This means that there is overconsumption of sugar and a welfare loss is created. The sugary drinks tax, a Pigovian tax, is a way to correct the negative externality by regulating the consumption of sugary drinks. Without a sugary drink tax, taxpayer money is used to pay for higher health care costs incurred from high consumption of sugar. Although this solution corrects the negative consumption externality, taxpayers that consume sugary drinks moderately and hence do not contribute to higher health care costs, still