Opinion: A flight of fancy?

After a harsh winter that has run into early April, anyone living
in the Northeast of the US will be familiar with the old adage
"one swallow does not a summer make".
The first of the migratory birds are already arriving from the
South across New York State, but the promise of temperatures
soaring into the 70s today and tomorrow looks like an aberration
with a dip back down into the 40s forecast for next week.
Similarly, investors in the...