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若持有标的资产且已产生盈利，投资者担心标的价格下跌，又不愿卖出标的资产从而错失标的价格上涨带来收益的可能性，则可支付较少的权利金买入平值认沽期权。如果标的价格下跌，投资者可以利用期权的盈利弥补标的价格下跌的损失；如果标的价格上涨，投资者损失权利金，但持有的标的资产可以继续获利。

汉密尔顿对于队友是否是转会而来并不介意，但他强调关键是保持队内的积极氛围是新队友能否与自己融洽相处的关键。“我感觉有史以来最好的能够开展竞争的队友是费尔南多-阿隆索，”汉密尔顿说，“我们现在拥有一位伟大的车手瓦尔特里，我很享受与他一起比赛。当然还有很多车手是我愿意一起与他们比赛的。我不介意谁成为我的队友，世界上的任何人，只要能够维持队内积极的气氛，希望（未来的队友）你也能在其他车队过得很好。我认为，和谐的氛围是最关键的。”

此外，华大基因在公告中表示，公司对网络传闻非常重视，经公司核查并向相关方征询，南京昌健誉嘉曾与华大研究院有技术服务合作关系，但并不存在名称的授权使用或实体的授权运营关系，且合作期间由于南京昌健誉嘉违约事项，华大研究院已解除全部合作关系，南京昌健誉嘉及员工王德明的所有行为，均不代表华大控股及华大研究院的立场、观点。

The retrospect of monetary policy in China shows that the necessary conditions for monetary policy transformation have been satisfied， but we also point out that the practice of monetary policy in modern sense lasts for only around twenty years， after abandoning the direct controls on credit behavior and turning to the quantity indirect policy with the money supply as the intermediate target in 1998． Central bank in China is always confronting the impetus of investment and credit expansion due the traditional growth-led economic mode． Because of the governmental preference to a higher growth rate， there are soft budget constraint sectors such as the local government vehicles， stated owned firms and housing industry enterprises． The supervisory affaires of the central bank in China were separated． While， due to the industry development dominance of the supervisory ideology， there are race to the bottom in the financial supervision， which promote the rapid growth of the shadow banking in recent years and financial risks are accumulated heavily． Although there is enough market breadth of the financial market， there are still too strict regulations and the market depth is relatively low． The monetary markets and bond markets are still separated， the admittance of the market， esp． the derivative markets are sill strictly controlled， the financial products are immature and there are still implicit dual interest track． The exchange rate is still lack of edacity．

综上，铁矿石1809合约将有所回调，但下方450元/吨支撑较强，建议在450—470元/吨的区间内高抛低吸。（作者单位：中信建投期货）责任编辑：牛鹏飞日本经济产业省6月18日发布2018年版《不公平贸易报告》。报告点名指责了美国特朗普政府以钢铁和铝进口限制为开端加强贸易保护主义的政策。

例如，小张持有某只ETF现价为4元/份，为了规避该ETF价格下行风险，他以0.2元/份的权利金买入行权价为3.5元/份的该ETF认沽期权。若合约到期时ETF价格已跌破3.5元/份，小张可以保证能以3.5元/份卖出该ETF；若届时ETF价格上涨，小张不行权，则损失0.2元/份的权利金。