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Most purchases, whether with cash or coins, not only increase your earning power but boost your XP (experience points.) Having lots of XP is essential to progressing, and no Farmville guide would be complete without making note of this.
A lot of cute and fun items that boost your XP are noted in the Farmville market. General offerings include fancy houses, dairy farms, tractors, harvesting, seeders and fuel refills. Periodically the designers feature special offers. Fall 2009 held a fall carnival theme with rides, floats, booths and more.
Special animals also show up throughout the market and usually can only be purchased with Farmville cash. While many animals (like the grey tabby cat or the doe offered in winter 2010 are cute and also generate periodic coins, this may not be the best investment of your hard-earned Farmville cash.