Complete the following table by entering the appropriate valuation base in each unshaded box.

\begin{tabular}{|l|l|l|}

\cline { 2 - 3 } \multicolumn{1}{c|}{} & Entry value & Exit value \\

\hline Past & & \\

\hline Present & & \\

\hline Future & & \\

\hline

\end{tabular}