Quote:
Heating-oil prices are expected to be higher this year than last.
Prices at the producer level are only 1.3 percent higher now than a year ago
Both sentences are not the same grammatically.
In the first, you compare this year, a noun, with another year, namely last year, another year.
However, in the second case you are comparing now, an adverb with a year ago, a noun.
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