Shaving off costs
When faced with the question "How can we cut 25% of the marketing budget in the best way?" it's easy to just cut 25% of all marketing activities. This is not a good way to cut costs. Usually all your tactics malfunction and the damage on lead generation and long term branding is bad.
Many marketers enter a panic mode and only focus on short-term conversion. This might look good in the excel sheet the first few months, but after a quarter or half a year the cost of sales (Customer Acquisition Cost etc) will gradually go up and sales really start to slow down.
Using analytics like automated MMM (econometrics, regression analysis) you will be able to make decisions based on critical data, like what activities have the largest impact on sales, short-term and long-term. By cutting out the activities that have a low affect on sales, you can make surgical cuts in your marketing budget, without damaging sales.