# Market Index Value Types

Market Index Values are categorized into three different types, with different characteristics and behaviour. These are not maintained by the system, the system will only give a market index value a default value based on the valid from date.

<table><thead><tr><th>Type</th><th>Default value when</th><th>Explanation</th><th data-type="checkbox">Used in calculations</th></tr></thead><tbody><tr><td>Spot</td><td>Valid from date is before or today</td><td>Any value that is marking the what the actual value was for the given valid from date.</td><td>true</td></tr><tr><td>Forward</td><td>Valid from date is after today</td><td>A value that is predicting the future values for a given period.</td><td>true</td></tr><tr><td>Historical Forward</td><td>Not given by the system automatically</td><td>An archived forward value.</td><td>false</td></tr></tbody></table>