问题如下：
A market has the following limit orders standing on its book for a particular stock:
Ian submits a day order to sell 1,000 shares, limit £19.83. Assuming that no more buy orders are submitted on that day after Ian submits his order, what would be Ian’s average trade price?
选项：
A.£19.70.
B.£19.92.
C.£20.05.
解释：
B is correct.
Ian’s average trade price is:
Ian’s sell order first fills with the most aggressively priced buy order, which is Mary’s order for 300 shares at £20.02. Ian still has 700 shares for sale. The next most aggressively priced buy order is Ann’s order for 400 shares at £19.89. This order is filled. Ian still has 300 shares for sale. The next most aggressively priced buy order is Paul’s order for 200 shares at £19.84. A third trade takes place. Ian still has 100 shares for sale. The next buy order is Keith’s order for 1,000 shares at £19.70. However, this price is below Ian’s limit price of £19.83. Therefore, no more trade is possible.
请问一下这道题里面的limit price是指的不低于吗？那如果说正好等于19.83的限价的话，题目里面的表达应该是怎样？有点迷糊什么时候是最低限价，什么时候是最高限价，以及指定交易价格的英文表达，谢谢。
