The thinness of the order book is also referred to as the liquidity of the market. If the market is highly liquid, then there are lots of orders and many of them are likely large. In this case, value can be traded easily. If the market is illiquid, or thin, then sizeable price swings with low volume will occur because someone trying to buy (or sell) a lot of the asset will fill all the available sell (or buy) orders, which drives the price up (or down). As a result, in thin or illiquid markets, when investors are bullish they can drive massive swings to the upside, just as when investors turn
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