NEW YORK ( TheStreet) - Holiday sales growth is expected to slow from last year, according to the National Retail Federation. While the retail research firm predicts a 2.8% increase to $465.6 billion, this is significantly slower than the 5.2% jump retailers experienced last year. It is just slightly higher than the 10-year average of a 2.6% increase. Retailers have experienced 14 consecutive months of sales growth, but persistently high unemployment and global economic fears will continue to plague the consumer this holiday season. The NRF also predicts retailers will hire between 480,000 and 500,000 seasonal workers, which compared with 495,000 temporary positions during the holiday period last year. >To contact the writer of this article, click here: Jeanine Poggi. >To follow the writer on Twitter, go to http://twitter.com/jpoggi. >To submit a news tip, send an email to: email@example.com.