LifePrime Research

Decisions worth doing the homework on.

Costs, tradeoffs, calculations and practical conclusions.

Money & Decisions

The Costco Math for a Two-Person Household

The membership fee is easy to calculate. The harder question is whether Costco changes what you buy, how much you waste,…

Home & Things

Your Old Windows May Not Be the Problem

New windows can make a house quieter, more comfortable and easier to maintain. If the goal is simply to cut the utility …

Buying Decisions

What Do You Get for a $700 Robot Vacuum?

Sometimes. But the extra money increasingly buys less babysitting rather than dramatically cleaner floors.…

Money & Decisions

The Few Times an Extended Warranty Makes Sense

Most service contracts are sold with a story about the one terrible repair you might face. The better calculation is the…

Money & Decisions

The Subscription Audit: Find the $500 You Forgot You Were Spending

The problem with subscriptions is rarely one enormous charge. It is the pile of small charges that no longer has to ask …

Money & Decisions

Your Savings Account Could Be Costing You Hundreds a Year

Moving cash is one of the least glamorous financial chores. When rate gaps are wide, doing nothing can cost hundreds or …

Money & Decisions

Forget the Three-Month Rule. How Much Emergency Cash Do You Need?

Three to six months is a useful slogan. It is not a calculation. Your real number depends on what can go wrong, what kee…

Home & Things

The Water Heater That Costs More Now and Less Later

If you are replacing a standard electric water heater, this is one of the home upgrades where the operating-cost math ca…

Home & Things

Before You Buy New Windows, Spend $1,000 Somewhere Else

The home improvement you can’t see may do more for comfort and energy use than the one that comes with a showroom.…

Money & Decisions

The $0 Down Trap: What Buy Now, Pay Later Really Costs

A zero-interest installment plan can be mathematically cheap. The risk is that splitting the price changes how expensive…