Why is the poem Richard Cory considered a modern poem ?

Even though
the poem was first published in 1897, the poem has universal appeal for its themes of
self-deception, envy, the haves and have-nots, and emptiness of spirit.

Throughout time, the economy in every country has its peak moments and its valley moments. 
Through all of this, the poor suffer greatly, the wealthy might take a hit, but they survive. 
The middle class sometimes suffers the most, and seeing no way...