Yes, it seems to be an alternative, in some situations acceptable, but eccentric and not neutral spelling of this word. It accents the fact that "ea" here are two separate vowels rather than a diphthong: that is the function of the trema (the two dots).
In practice it's not used much, because it's not really necessary: it does not distinguish it from any other word, and trema is not easy to find on English keyboards: so there is no need.
Answer:
Kenny Chesney made a good point, "How do we know the wooden plane can fly if we've never actually tested it?"
Explanation:
The best situation for the example in our daily lives would be that every purchase you make at a chain store is sale that a local small business misses out on.
Zero- sum is a circumstance in game hypothesis in which one individual's gain is identical to another's misfortune. A zero- sum game in this instance speaks to the accompanying circumstance: if the amount of sales increments for a chain store, at that point the measure of sales will similarly diminish in a little store
