It’s a seller’s market across the country, and “For Sale” signs are not staying up long. The limited inventory, especially in the entry-level segment, means fierce competition among buyers.

Resale inventory is the lowest in 18 years, according to real estate data firm CoreLogic. Entry-level homes were the most limited, with just a three-month supply for sale, compared with a seven-month supply of more-expensive homes. The months’ supply gauges how long the for-sale inventory would last if no new homes were built at the current sales rate.

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