Provide the structure(s) of the product(s) in the following reaction sequence. 
Definitions:
ROI
Return on Investment, a financial metric used to evaluate the efficiency or profitability of an investment, calculated by dividing the net profit by the cost of the investment.
A/B Testing
A statistical way of comparing two versions (A and B) of a webpage or app against each other to determine which one performs better.
Key Performance Indicator
A measurable value that demonstrates how effectively a company is achieving key business objectives.
Advertising Equivalency
A metric used to compare the value of traditional advertising space to publicity or media coverage achieved through other means.
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