public void setMarket(String market) {
        this.market = market;
    }
<p>
The instance purchasing option. Valid values are <code>ON_DEMAND</code> or <code>SPOT</code>.
</p>

@param market
       The instance purchasing option. Valid values are <code>ON_DEMAND</code> or <code>SPOT</code>.
@see MarketType
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/Instance.java