How could you describe the couple?

Answer:

Stingy.
Discussion:
They asked the porter about the charges for delivering their goods at their home. The old porter quoted just a $20, a well below the market rate for delivering goods at couple’s home in his cart. Yet, the couple argued and bargained with the porter and finally settled for $15. The porter was struggling to make even one time’s meal so he needed anything he can earn.
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