How much does the job pay? <a href=" http://eastlondondance.org/information-on-nexium.pdf ">informacion del medicamento nexium</a> In their basic form, options contracts are known as puts and calls. The buyer of a put has a right to sell the asset (like 100 shares of a stock or exchange-traded fund) at an agreed-on price. That could provide downside protection if the asset plummets in value. A call conveys the right to buy shares at an agreed-on price.