Two people are compared in a few short lines, and the comparison is rigged from the start. He has one year of experience and no one depending on him. She has ten years behind her and two children at home. By any fair measure, the job should be hers. Instead it goes to him, and all he needed was a smile.
The speaker never says "I'm angry," but the feeling comes through in the plain, flat list of facts. The "And yet" near the end is where the poem turns, like a door slamming. The last line is the hardest: the loss isn't just professional, because her family ends up hungry and on the street.
The mood is bitter and heavy. The poem's title names the problem directly, calling it unfair and unjust, and the short, simple lines make the unfairness feel ordinary, which is part of what makes it so upsetting.