Foreign direct investment reports often place several large numbers close together. A stock figure can sit beside an annual flow, a project estimate, and a growth rate. Each number can be correct, but the comparison can still be wrong. The first research task is to label the measure before explaining the movement.
Start with the unit of observation
Investment stock is a position at a stated date. It can include capital accumulated across many years and adjustments that are not new projects. Investment flow covers activity during a period. A positive flow can add to stock, but exchange-rate changes, valuation changes, withdrawals, and other adjustments can also change the final position. A project announcement is different again. It records an intention or estimate and does not by itself prove that capital was invested.
The JETRO investment statistics index gives direct access to Japan’s inward and outward FDI materials. Before copying a figure, record five fields: direction, accounting basis, period, currency, and revision date. If one field is absent, the number is not ready for a comparison table.
Make the comparison explicit
For a Japan–Europe note, define “Europe.” One source can mean the European Union, another can include the United Kingdom and Switzerland, and another can use a wider regional group. A country ranking cannot be compared with a regional share unless the levels are kept separate.
A useful worksheet has one row per claim and these columns:
- source organization and table;
- measure, such as stock or net flow;
- inward or outward direction;
- start and end date;
- geographic scope;
- original currency and unit;
- release or revision date; and
- any note about negative values, withdrawals, or confidential data.
Do not convert currencies until the original values are stored. A converted table also needs the exchange-rate source and conversion date. Otherwise, a later researcher cannot tell whether a difference came from investment activity or from the conversion method.
Read change with restraint
One year of flow can be volatile because a small number of transactions can dominate the result. A negative net flow does not necessarily mean that all investors left a market. It can show that withdrawals exceeded new investment during that period. A record stock does not necessarily mean that the latest annual flow was also a record.
Use three statements when the evidence permits them: what the measure is, how it changed, and what the source says caused the change. Keep any further explanation under a separate analysis label. This structure prevents a narrative from becoming part of the reported data.
The final check is simple: could a reader rebuild the number from the cited table? If the answer is no, the claim needs a clearer source, scope, or date. Precision is more useful than a large figure without a defined denominator.