Intangible assets derived mostly from human capital are on the rise, according to the advisory firm, Ocean Tomo. A study of the Standard and Poors $500$ index from $1975$ to $2015$ demonstrated a $17$ percent increase in market value of intangible assets over this time period. Companies such as Stryker get $70$ percent of their value from $\_\_\_\_\_\_\_\_$Blank assets.