Hi Suzanne,
Spend Recommendation Tool helps to identify the optimal spend distribution across optimized and active portfolios with the same objective and currency. This distribution of spend is made in order to maximize the revenue for the chosen Portfolio set.
Spend recommendations and click projections are shown for portfolios with the objective Maximize Clicks, whereas spend recommendations and revenue projections are shown for all other objectives.
Hope this answers your Question.
-Ritika Mahajan